feat: define governed tenant erasure contracts

docs/ACCESS_RBAC_MODEL.md

@@ -142,6 +142,7 @@ system:tenants:read
 system:tenants:create
 system:tenants:update
 system:tenants:suspend
+system:tenants:erase
 
 system:accounts:read
 system:accounts:create

docs/MODULE_ARCHITECTURE.md

@@ -128,6 +128,8 @@ The following contracts are the baseline API that modules can rely on:
 - bounded reference-option search provider contract
 - single-tenant and optional batched tenant summary provider contracts
 - tenant delete-veto provider contract
+- provider-neutral tenant-erasure preview, step, idempotency, and
+  reconciliation contracts in `govoplan_core.core.tenant_erasure`
 - WebUI module contribution contract
 - navigation metadata contract
 - command/event envelope contract
@@ -149,6 +151,17 @@ Destructive tenant lifecycle planning deliberately continues to use the
 single-tenant path so it invokes every registered provider for the target
 tenant, independent of ordinary list-page projections.
 
+Governed populated-tenant erasure is separate from ordinary delete vetoes.
+Modules contribute `tenancy.erasure_provider.<module_id>` capabilities with a
+bounded resource inventory, explicit erase/retain/legal-hold/external/key/
+backup dispositions, ordered destructive warnings, idempotent step execution,
+and reconciliation. The collector fails closed when a provider is invalid or
+fails. A module with nonzero tenant summary counts and no erasure capability is
+reported as unsupported and blocks execution; modules with neither contract
+are explicitly projected as outside tenant-persistence scope. Provider
+evidence contains counts and stable references only and must never contain
+secrets or erased subject data.
+
 This list is the Milestone A kernel-contract freeze baseline. New module work
 may extend the kernel by adding explicit contracts, but existing contracts must
 remain source-compatible through the 0.1.x split line unless a migration shim

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "govoplan-core"
-version = "0.1.42"
+version = "0.1.43"
 description = "Reusable GovOPlaN platform core, access, tenancy, and RBAC components."
 readme = "README.md"
 requires-python = ">=3.12"

src/govoplan_core/core/tenant_erasure.py

@@ -0,0 +1,467 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+from dataclasses import dataclass, field
+from datetime import UTC, datetime
+from typing import Literal, Protocol, runtime_checkable
+
+
+TENANT_ERASURE_PROVIDER_CAPABILITY_PREFIX = "tenancy.erasure_provider."
+
+TenantErasureDisposition = Literal[
+    "erase",
+    "retain",
+    "legal_hold",
+    "external_cleanup",
+    "key_destroy",
+    "backup_expiry",
+    "unavailable",
+]
+TenantErasureStepKind = Literal[
+    "export",
+    "erase",
+    "retain",
+    "external_cleanup",
+    "key_destroy",
+    "backup_expiry",
+    "verify",
+]
+TenantErasureResultState = Literal[
+    "completed",
+    "pending",
+    "blocked",
+    "outcome_unknown",
+]
+
+_DISPOSITIONS = frozenset(
+    {
+        "erase",
+        "retain",
+        "legal_hold",
+        "external_cleanup",
+        "key_destroy",
+        "backup_expiry",
+        "unavailable",
+    }
+)
+_STEP_KINDS = frozenset(
+    {
+        "export",
+        "erase",
+        "retain",
+        "external_cleanup",
+        "key_destroy",
+        "backup_expiry",
+        "verify",
+    }
+)
+_RESULT_STATES = frozenset(
+    {"completed", "pending", "blocked", "outcome_unknown"}
+)
+
+
+def _text(value: str, label: str, *, maximum: int) -> str:
+    normalized = value.strip()
+    if (
+        not normalized
+        or len(normalized) > maximum
+        or any(ord(character) < 32 for character in normalized)
+    ):
+        raise ValueError(f"Tenant erasure {label} is invalid.")
+    return normalized
+
+
+def _texts(
+    values: tuple[str, ...],
+    label: str,
+    *,
+    maximum_items: int = 100,
+    maximum_length: int = 500,
+) -> tuple[str, ...]:
+    if len(values) > maximum_items:
+        raise ValueError(f"Tenant erasure {label} has too many entries.")
+    normalized = tuple(
+        _text(value, label, maximum=maximum_length) for value in values
+    )
+    if len(normalized) != len(set(normalized)):
+        raise ValueError(f"Tenant erasure {label} contains duplicates.")
+    return normalized
+
+
+def _metrics(values: Mapping[str, int]) -> dict[str, int]:
+    if len(values) > 30:
+        raise ValueError("Tenant erasure metrics has too many entries.")
+    normalized: dict[str, int] = {}
+    for key, value in values.items():
+        normalized_key = _text(key, "metric key", maximum=80)
+        if type(value) is not int or value < 0:
+            raise ValueError("Tenant erasure metric values must be non-negative integers.")
+        normalized[normalized_key] = value
+    return normalized
+
+
+@dataclass(frozen=True, slots=True)
+class TenantErasureResource:
+    resource_type: str
+    count: int
+    disposition: TenantErasureDisposition
+    summary: str
+    governance_ref: str | None = None
+    external: bool = False
+
+    def __post_init__(self) -> None:
+        _text(self.resource_type, "resource type", maximum=120)
+        _text(self.summary, "resource summary", maximum=1000)
+        if type(self.count) is not int or self.count < 0:
+            raise ValueError("Tenant erasure resource count is invalid.")
+        if self.disposition not in _DISPOSITIONS:
+            raise ValueError("Tenant erasure resource disposition is invalid.")
+        if self.governance_ref is not None:
+            _text(self.governance_ref, "governance reference", maximum=300)
+
+    def to_dict(self) -> dict[str, object]:
+        return {
+            "resource_type": self.resource_type,
+            "count": self.count,
+            "disposition": self.disposition,
+            "summary": self.summary,
+            "governance_ref": self.governance_ref,
+            "external": self.external,
+        }
+
+
+@dataclass(frozen=True, slots=True)
+class TenantErasureStep:
+    step_id: str
+    kind: TenantErasureStepKind
+    summary: str
+    destructive: bool
+    irreversible: bool
+    requires_reconciliation: bool = False
+    depends_on: tuple[str, ...] = ()
+
+    def __post_init__(self) -> None:
+        _text(self.step_id, "step id", maximum=160)
+        _text(self.summary, "step summary", maximum=1000)
+        if self.kind not in _STEP_KINDS:
+            raise ValueError("Tenant erasure step kind is invalid.")
+        _texts(self.depends_on, "step dependencies", maximum_length=160)
+        if self.step_id in self.depends_on:
+            raise ValueError("Tenant erasure step cannot depend on itself.")
+        if self.irreversible and not self.destructive:
+            raise ValueError("An irreversible tenant erasure step must be destructive.")
+
+    def to_dict(self) -> dict[str, object]:
+        return {
+            "step_id": self.step_id,
+            "kind": self.kind,
+            "summary": self.summary,
+            "destructive": self.destructive,
+            "irreversible": self.irreversible,
+            "requires_reconciliation": self.requires_reconciliation,
+            "depends_on": list(self.depends_on),
+        }
+
+
+@dataclass(frozen=True, slots=True)
+class TenantErasurePreview:
+    module_id: str
+    complete: bool
+    resources: tuple[TenantErasureResource, ...] = ()
+    steps: tuple[TenantErasureStep, ...] = ()
+    blockers: tuple[str, ...] = ()
+    warnings: tuple[str, ...] = ()
+    provider_revision: str = "1"
+
+    def __post_init__(self) -> None:
+        _text(self.module_id, "module id", maximum=120)
+        _text(self.provider_revision, "provider revision", maximum=120)
+        _texts(self.blockers, "blockers", maximum_length=1000)
+        _texts(self.warnings, "warnings", maximum_length=1000)
+        if len(self.resources) > 500 or len(self.steps) > 500:
+            raise ValueError("Tenant erasure preview is too large.")
+        resource_types = [item.resource_type for item in self.resources]
+        if len(resource_types) != len(set(resource_types)):
+            raise ValueError("Tenant erasure preview repeats a resource type.")
+        resources_requiring_action = tuple(
+            item for item in self.resources if item.count > 0
+        )
+        if resources_requiring_action and not self.steps and not self.blockers:
+            raise ValueError(
+                "Tenant erasure resources require steps or an explicit blocker."
+            )
+        if any(
+            item.count > 0 and item.disposition == "unavailable"
+            for item in self.resources
+        ) and not self.blockers:
+            raise ValueError(
+                "Unavailable tenant erasure resources require an explicit blocker."
+            )
+        if not self.complete and not self.blockers:
+            raise ValueError(
+                "An incomplete tenant erasure preview requires an explicit blocker."
+            )
+        step_ids = [item.step_id for item in self.steps]
+        if len(step_ids) != len(set(step_ids)):
+            raise ValueError("Tenant erasure preview repeats a step id.")
+        known_step_ids = set(step_ids)
+        if any(
+            dependency not in known_step_ids
+            for step in self.steps
+            for dependency in step.depends_on
+        ):
+            raise ValueError("Tenant erasure step references an unknown dependency.")
+        remaining = {
+            step.step_id: set(step.depends_on)
+            for step in self.steps
+        }
+        resolved: set[str] = set()
+        while remaining:
+            ready = sorted(
+                step_id
+                for step_id, dependencies in remaining.items()
+                if dependencies.issubset(resolved)
+            )
+            if not ready:
+                raise ValueError("Tenant erasure step dependencies contain a cycle.")
+            resolved.update(ready)
+            for step_id in ready:
+                remaining.pop(step_id)
+
+    @property
+    def allowed(self) -> bool:
+        return self.complete and not self.blockers
+
+    def to_dict(self) -> dict[str, object]:
+        return {
+            "module_id": self.module_id,
+            "complete": self.complete,
+            "allowed": self.allowed,
+            "provider_revision": self.provider_revision,
+            "resources": [item.to_dict() for item in self.resources],
+            "steps": [item.to_dict() for item in self.steps],
+            "blockers": list(self.blockers),
+            "warnings": list(self.warnings),
+        }
+
+
+@dataclass(frozen=True, slots=True)
+class TenantErasureStepResult:
+    state: TenantErasureResultState
+    summary: str
+    receipt_ref: str | None = None
+    metrics: Mapping[str, int] = field(default_factory=dict)
+
+    def __post_init__(self) -> None:
+        if self.state not in _RESULT_STATES:
+            raise ValueError("Tenant erasure result state is invalid.")
+        _text(self.summary, "result summary", maximum=1000)
+        if self.receipt_ref is not None:
+            _text(self.receipt_ref, "receipt reference", maximum=500)
+        _metrics(self.metrics)
+
+    def to_dict(self) -> dict[str, object]:
+        return {
+            "state": self.state,
+            "summary": self.summary,
+            "receipt_ref": self.receipt_ref,
+            "metrics": dict(sorted(_metrics(self.metrics).items())),
+        }
+
+
+@runtime_checkable
+class TenantErasureProvider(Protocol):
+    module_id: str
+
+    def preview_tenant_erasure(
+        self,
+        session: object,
+        tenant_id: str,
+    ) -> TenantErasurePreview:
+        ...
+
+    def execute_tenant_erasure_step(
+        self,
+        session: object,
+        tenant_id: str,
+        step_id: str,
+        idempotency_key: str,
+    ) -> TenantErasureStepResult:
+        ...
+
+    def reconcile_tenant_erasure_step(
+        self,
+        session: object,
+        tenant_id: str,
+        step_id: str,
+        idempotency_key: str,
+    ) -> TenantErasureStepResult:
+        ...
+
+
+@dataclass(frozen=True, slots=True)
+class TenantErasureInventory:
+    tenant_id: str
+    generated_at: datetime
+    complete: bool
+    modules: tuple[TenantErasurePreview, ...]
+
+    @property
+    def allowed(self) -> bool:
+        return self.complete and all(item.allowed for item in self.modules)
+
+    def to_dict(self) -> dict[str, object]:
+        generated_at = self.generated_at
+        if generated_at.tzinfo is None:
+            generated_at = generated_at.replace(tzinfo=UTC)
+        return {
+            "schema_version": 1,
+            "tenant_id": self.tenant_id,
+            "generated_at": generated_at.astimezone(UTC).isoformat(),
+            "complete": self.complete,
+            "allowed": self.allowed,
+            "modules": [item.to_dict() for item in self.modules],
+        }
+
+
+def tenant_erasure_providers(registry: object) -> dict[str, TenantErasureProvider]:
+    capability_names = getattr(registry, "capability_names", None)
+    capability = getattr(registry, "capability", None)
+    if not callable(capability_names) or not callable(capability):
+        raise ValueError("Tenant erasure requires a module registry.")
+    providers: dict[str, TenantErasureProvider] = {}
+    for capability_name in sorted(capability_names()):
+        if not capability_name.startswith(TENANT_ERASURE_PROVIDER_CAPABILITY_PREFIX):
+            continue
+        expected_module_id = capability_name.removeprefix(
+            TENANT_ERASURE_PROVIDER_CAPABILITY_PREFIX
+        )
+        provider = capability(capability_name)
+        if not isinstance(provider, TenantErasureProvider):
+            raise TypeError(
+                f"Tenant erasure provider {expected_module_id or 'unknown'} is invalid."
+            )
+        module_id = _text(provider.module_id, "provider module id", maximum=120)
+        if module_id != expected_module_id or module_id in providers:
+            raise ValueError("Tenant erasure provider identity is invalid.")
+        providers[module_id] = provider
+    return providers
+
+
+def collect_tenant_erasure_inventory(
+    registry: object,
+    session: object,
+    tenant_id: str,
+    *,
+    observed_at: datetime | None = None,
+) -> TenantErasureInventory:
+    normalized_tenant_id = _text(tenant_id, "tenant id", maximum=120)
+    manifests = getattr(registry, "manifests", None)
+    summary_providers = getattr(registry, "tenant_summary_providers", None)
+    if not callable(manifests) or not callable(summary_providers):
+        raise ValueError("Tenant erasure inventory requires a module registry.")
+    provider_by_module = tenant_erasure_providers(registry)
+    summary_by_module = dict(summary_providers())
+    manifest_ids = {
+        str(manifest.id)
+        for manifest in manifests()
+        if getattr(manifest, "id", None)
+    }
+    module_ids = manifest_ids | set(summary_by_module) | set(provider_by_module)
+    previews: list[TenantErasurePreview] = []
+    complete = True
+    for module_id in sorted(module_ids):
+        provider = provider_by_module.get(module_id)
+        if provider is not None:
+            try:
+                preview = provider.preview_tenant_erasure(session, normalized_tenant_id)
+                if not isinstance(preview, TenantErasurePreview):
+                    raise TypeError("provider returned an invalid preview")
+                if preview.module_id != module_id:
+                    raise ValueError("provider returned another module's preview")
+            except Exception as exc:
+                complete = False
+                preview = TenantErasurePreview(
+                    module_id=module_id,
+                    complete=False,
+                    blockers=(
+                        f"{type(exc).__name__}: provider preview could not be completed",
+                    ),
+                )
+            previews.append(preview)
+            complete = complete and preview.complete
+            continue
+        summary_provider = summary_by_module.get(module_id)
+        if summary_provider is None:
+            previews.append(
+                TenantErasurePreview(
+                    module_id=module_id,
+                    complete=True,
+                    warnings=(
+                        "Module declares no tenant-owned summary or erasure provider; no tenant persistence is in scope.",
+                    ),
+                    provider_revision="manifest-no-tenant-data",
+                )
+            )
+            continue
+        try:
+            raw_counts = summary_provider(session, normalized_tenant_id)
+            counts = _metrics({str(key): int(value) for key, value in raw_counts.items()})
+            resources = tuple(
+                TenantErasureResource(
+                    resource_type=resource_type,
+                    count=count,
+                    disposition="unavailable" if count else "erase",
+                    summary=(
+                        "Tenant-owned data requires a module erasure provider."
+                        if count
+                        else "The module reported no tenant-owned records."
+                    ),
+                )
+                for resource_type, count in sorted(counts.items())
+            )
+            blockers = (
+                ("Tenant-owned data exists but the module has no erasure provider.",)
+                if any(counts.values())
+                else ()
+            )
+            preview = TenantErasurePreview(
+                module_id=module_id,
+                complete=True,
+                resources=resources,
+                blockers=blockers,
+                provider_revision="tenant-summary-fallback",
+            )
+        except Exception as exc:
+            complete = False
+            preview = TenantErasurePreview(
+                module_id=module_id,
+                complete=False,
+                blockers=(
+                    f"{type(exc).__name__}: tenant summary could not be completed",
+                ),
+                provider_revision="tenant-summary-fallback",
+            )
+        previews.append(preview)
+    timestamp = observed_at or datetime.now(UTC)
+    if timestamp.tzinfo is None:
+        timestamp = timestamp.replace(tzinfo=UTC)
+    return TenantErasureInventory(
+        tenant_id=normalized_tenant_id,
+        generated_at=timestamp,
+        complete=complete,
+        modules=tuple(previews),
+    )
+
+
+__all__ = [
+    "TENANT_ERASURE_PROVIDER_CAPABILITY_PREFIX",
+    "TenantErasureInventory",
+    "TenantErasurePreview",
+    "TenantErasureProvider",
+    "TenantErasureResource",
+    "TenantErasureStep",
+    "TenantErasureStepResult",
+    "collect_tenant_erasure_inventory",
+    "tenant_erasure_providers",
+]

src/govoplan_core/security/module_permissions.py

@@ -27,6 +27,7 @@ LEGACY_TO_MODULE_SCOPES: dict[str, str] = {
     "system:tenants:create": "access:tenant:create",
     "system:tenants:update": "access:tenant:update",
     "system:tenants:suspend": "access:tenant:suspend",
+    "system:tenants:erase": "access:tenant:erase",
     "system:accounts:read": "access:account:read",
     "system:accounts:create": "access:account:create",
     "system:accounts:update": "access:account:update",

src/govoplan_core/security/permissions.py

@@ -78,6 +78,7 @@ SYSTEM_PERMISSIONS: tuple[PermissionDefinition, ...] = (
     PermissionDefinition("system:tenants:create", "Create tenants", "Create new tenant spaces.", "System administration", "system"),
     PermissionDefinition("system:tenants:update", "Update tenants", "Edit tenant metadata and governance overrides.", "System administration", "system"),
     PermissionDefinition("system:tenants:suspend", "Suspend tenants", "Activate or suspend tenant spaces while preserving evidence.", "System administration", "system"),
+    PermissionDefinition("system:tenants:erase", "Erase tenants", "Preview, approve, execute, and reconcile governed destructive tenant erasure.", "System administration", "system"),
     PermissionDefinition("system:accounts:read", "View accounts", "List global login accounts and memberships.", "System administration", "system"),
     PermissionDefinition("system:accounts:create", "Create accounts", "Create global login accounts.", "System administration", "system"),
     PermissionDefinition("system:accounts:update", "Update accounts", "Edit global account metadata.", "System administration", "system"),

tests/test_module_system.py

@@ -344,6 +344,18 @@ class ModuleSystemTests(unittest.TestCase):
         self.assertTrue(scopes_grant_compatible(["access:membership:read"], "admin:users:read"))
         self.assertTrue(scopes_grant_compatible(["admin:users:read"], "access:membership:read"))
         self.assertTrue(scopes_grant_compatible(["access:tenant:read"], "system:tenants:read"))
+        self.assertTrue(
+            scopes_grant_compatible(
+                ["access:tenant:erase"],
+                "system:tenants:erase",
+            )
+        )
+        self.assertFalse(
+            scopes_grant_compatible(
+                ["system:tenants:write"],
+                "system:tenants:erase",
+            )
+        )
         self.assertTrue(scopes_grant_compatible(["system:*"], "access:tenant:read"))
         self.assertTrue(
             scopes_grant_compatible(
@@ -1015,8 +1027,10 @@ finally:
                         json={"mode": "destroy", "reason": "not supported"},
                     )
                     self.assertEqual(409, destructive.status_code, destructive.text)
-                    issue_codes = {item["code"] for item in destructive.json()["detail"]["plan"]["issues"]}
-                    self.assertIn("tenant_data_present", issue_codes)
+                    self.assertIn(
+                        "Direct destructive deletion is disabled",
+                        destructive.json()["detail"]["message"],
+                    )
 
                     with database.session() as session:
                         empty_tenant = Tenant(
@@ -1029,15 +1043,43 @@ finally:
                         session.commit()
                         empty_tenant_id = empty_tenant.id
 
-                    destroyed = client.request(
-                        "DELETE",
-                        f"/api/v1/admin/tenants/{empty_tenant_id}",
+                    erasure_policy = client.patch(
+                        "/api/v1/admin/tenant-erasure-policy",
                         headers=headers,
-                        json={"mode": "destroy", "reason": "empty tenant cleanup"},
+                        json={
+                            "production_profile": False,
+                            "required_approvals": 1,
+                            "preview_ttl_seconds": 900,
+                            "recent_authentication_seconds": 900,
+                        },
                     )
-                    self.assertEqual(200, destroyed.status_code, destroyed.text)
-                    self.assertEqual("destroy", destroyed.json()["plan"]["action"])
-                    self.assertTrue(destroyed.json()["plan"]["destructive_supported"])
+                    self.assertEqual(200, erasure_policy.status_code, erasure_policy.text)
+                    erasure_preview = client.post(
+                        f"/api/v1/admin/tenants/{empty_tenant_id}/erasure-operations",
+                        headers=headers,
+                        json={
+                            "idempotency_key": f"empty-destroy-{name}",
+                            "reason": "empty tenant cleanup",
+                        },
+                    )
+                    self.assertEqual(201, erasure_preview.status_code, erasure_preview.text)
+                    self.assertTrue(erasure_preview.json()["preview"]["allowed"])
+                    operation_id = erasure_preview.json()["id"]
+                    approved_erasure = client.post(
+                        f"/api/v1/admin/tenants/{empty_tenant_id}/erasure-operations/{operation_id}/approve",
+                        headers=headers,
+                        json={"confirmation": f"empty-destroy-{name}"},
+                    )
+                    self.assertEqual(200, approved_erasure.status_code, approved_erasure.text)
+                    self.assertEqual("ready", approved_erasure.json()["state"])
+                    executed_erasure = client.post(
+                        f"/api/v1/admin/tenants/{empty_tenant_id}/erasure-operations/{operation_id}/execute",
+                        headers=headers,
+                        json={"confirmation": f"empty-destroy-{name}"},
+                    )
+                    self.assertEqual(200, executed_erasure.status_code, executed_erasure.text)
+                    self.assertEqual("completed", executed_erasure.json()["state"])
+                    self.assertIsNone(executed_erasure.json()["reason"])
 
                     retired = client.request(
                         "DELETE",

tests/test_tenant_erasure_contract.py

@@ -0,0 +1,180 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+from types import SimpleNamespace
+
+import pytest
+
+from govoplan_core.core.tenant_erasure import (
+    TENANT_ERASURE_PROVIDER_CAPABILITY_PREFIX,
+    TenantErasurePreview,
+    TenantErasureResource,
+    TenantErasureStep,
+    TenantErasureStepResult,
+    collect_tenant_erasure_inventory,
+    tenant_erasure_providers,
+)
+
+
+class _Provider:
+    module_id = "files"
+
+    def preview_tenant_erasure(self, session, tenant_id: str) -> TenantErasurePreview:
+        del session
+        assert tenant_id == "tenant-1"
+        return TenantErasurePreview(
+            module_id=self.module_id,
+            complete=True,
+            resources=(
+                TenantErasureResource(
+                    resource_type="file_blobs",
+                    count=2,
+                    disposition="erase",
+                    summary="Two tenant-owned file blobs will be erased.",
+                ),
+            ),
+            steps=(
+                TenantErasureStep(
+                    step_id="erase-blobs",
+                    kind="erase",
+                    summary="Erase tenant-owned file blobs.",
+                    destructive=True,
+                    irreversible=True,
+                ),
+            ),
+        )
+
+    def execute_tenant_erasure_step(
+        self, session, tenant_id: str, step_id: str, idempotency_key: str
+    ) -> TenantErasureStepResult:
+        del session, tenant_id, step_id, idempotency_key
+        return TenantErasureStepResult(
+            state="completed",
+            summary="Tenant file blobs erased.",
+            metrics={"deleted": 2},
+        )
+
+    def reconcile_tenant_erasure_step(
+        self, session, tenant_id: str, step_id: str, idempotency_key: str
+    ) -> TenantErasureStepResult:
+        return self.execute_tenant_erasure_step(
+            session, tenant_id, step_id, idempotency_key
+        )
+
+
+class _Registry:
+    def __init__(self, *, provider: object | None = None, counts: dict[str, int] | None = None):
+        self._provider = provider
+        self._counts = counts
+
+    def manifests(self):
+        return (
+            SimpleNamespace(id="core"),
+            SimpleNamespace(id="files"),
+            SimpleNamespace(id="wiki"),
+        )
+
+    def capability_names(self):
+        if self._provider is None:
+            return ()
+        return (f"{TENANT_ERASURE_PROVIDER_CAPABILITY_PREFIX}files",)
+
+    def capability(self, name: str):
+        assert name.endswith("files")
+        return self._provider
+
+    def tenant_summary_providers(self):
+        if self._counts is None:
+            return {}
+        return {"files": lambda _session, _tenant_id: self._counts}
+
+
+def test_contract_rejects_unsafe_irreversible_step() -> None:
+    with pytest.raises(ValueError, match="must be destructive"):
+        TenantErasureStep(
+            step_id="unsafe",
+            kind="erase",
+            summary="Invalid step.",
+            destructive=False,
+            irreversible=True,
+        )
+
+
+def test_contract_rejects_cyclic_step_dependencies() -> None:
+    with pytest.raises(ValueError, match="contain a cycle"):
+        TenantErasurePreview(
+            module_id="files",
+            complete=True,
+            steps=(
+                TenantErasureStep(
+                    step_id="first",
+                    kind="erase",
+                    summary="First.",
+                    destructive=True,
+                    irreversible=True,
+                    depends_on=("second",),
+                ),
+                TenantErasureStep(
+                    step_id="second",
+                    kind="verify",
+                    summary="Second.",
+                    destructive=False,
+                    irreversible=False,
+                    depends_on=("first",),
+                ),
+            ),
+        )
+
+
+def test_contract_requires_action_or_blocker_for_tenant_data() -> None:
+    resource = TenantErasureResource(
+        resource_type="files",
+        count=1,
+        disposition="erase",
+        summary="One file exists.",
+    )
+    with pytest.raises(ValueError, match="steps or an explicit blocker"):
+        TenantErasurePreview(
+            module_id="files",
+            complete=True,
+            resources=(resource,),
+        )
+
+
+def test_inventory_collects_provider_and_marks_non_data_modules() -> None:
+    inventory = collect_tenant_erasure_inventory(
+        _Registry(provider=_Provider()),
+        object(),
+        "tenant-1",
+        observed_at=datetime(2026, 8, 24, 12, 0, tzinfo=UTC),
+    )
+
+    assert inventory.complete
+    assert inventory.allowed
+    assert [item.module_id for item in inventory.modules] == ["core", "files", "wiki"]
+    assert inventory.modules[1].steps[0].irreversible
+    assert inventory.to_dict()["generated_at"] == "2026-08-24T12:00:00+00:00"
+
+
+def test_summary_fallback_blocks_when_data_exists() -> None:
+    inventory = collect_tenant_erasure_inventory(
+        _Registry(counts={"file_blobs": 3}),
+        object(),
+        "tenant-1",
+    )
+
+    files = next(item for item in inventory.modules if item.module_id == "files")
+    assert inventory.complete
+    assert not inventory.allowed
+    assert files.resources[0].disposition == "unavailable"
+    assert files.blockers == (
+        "Tenant-owned data exists but the module has no erasure provider.",
+    )
+
+
+def test_provider_identity_must_match_capability_suffix() -> None:
+    provider = _Provider()
+    provider.module_id = "mail"
+
+    with pytest.raises(ValueError, match="identity"):
+        tenant_erasure_providers(_Registry(provider=provider))

webui/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.42",
+  "version": "0.1.43",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@govoplan/core-webui",
-      "version": "0.1.42",
+      "version": "0.1.43",
       "dependencies": {
         "@govoplan/access-webui": "file:../../govoplan-access/webui",
         "@govoplan/addresses-webui": "file:../../govoplan-addresses/webui",

webui/package-lock.release.json

@@ -1,14 +1,14 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.42",
+  "version": "0.1.43",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@govoplan/core-webui",
-      "version": "0.1.42",
+      "version": "0.1.43",
       "dependencies": {
-        "@govoplan/access-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-access.git#v0.1.23",
+        "@govoplan/access-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-access.git#v0.1.24",
         "@govoplan/admin-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-admin.git#v0.1.22",
         "@govoplan/audit-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-audit.git#v0.1.20",
         "@govoplan/calendar-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-calendar.git#v0.1.22",
@@ -757,8 +757,8 @@
       "optional": true
     },
     "node_modules/@govoplan/access-webui": {
-      "version": "0.1.23",
-      "resolved": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-access.git#e55434f406e953a2fa9e881abb8fb6dccbabd812",
+      "version": "0.1.24",
+      "resolved": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-access.git#0f8a05f8b95340de7e0aa1569a51589764b0776e",
       "peerDependencies": {
         "@govoplan/core-webui": "^0.1.18",
         "lucide-react": "^1.23.0",

webui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.42",
+  "version": "0.1.43",
   "private": true,
   "type": "module",
   "main": "src/index.ts",

webui/package.release.json

@@ -1,6 +1,6 @@
 {
   "name": "@govoplan/core-webui",
-  "version": "0.1.42",
+  "version": "0.1.43",
   "private": true,
   "type": "module",
   "main": "src/index.ts",
@@ -26,7 +26,7 @@
     "preview": "vite preview --host 127.0.0.1 --port 4173"
   },
   "dependencies": {
-    "@govoplan/access-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-access.git#v0.1.23",
+    "@govoplan/access-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-access.git#v0.1.24",
     "@govoplan/admin-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-admin.git#v0.1.22",
     "@govoplan/audit-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-audit.git#v0.1.20",
     "@govoplan/calendar-webui": "git+ssh://git@git.add-ideas.de/GovOPlaN/govoplan-calendar.git#v0.1.22",