fix(release): fail closed on dashboard parse errors

tools/release/govoplan_release/contracts.py

@@ -13,6 +13,7 @@ from pathlib import Path
 
 from .model import (
     CompatibilityIssue,
+    DashboardCollectionError,
     InterfaceProviderSnapshot,
     InterfaceRequirementSnapshot,
     ModuleContractSnapshot,
@@ -33,6 +34,43 @@ def collect_contracts(repositories: tuple[RepositorySnapshot, ...]) -> tuple[Mod
     return tuple(contracts)
 
 
+def collect_contracts_with_diagnostics(
+    repositories: tuple[RepositorySnapshot, ...],
+) -> tuple[tuple[ModuleContractSnapshot, ...], tuple[DashboardCollectionError, ...]]:
+    """Collect readable contracts and retain bounded parse diagnostics for the UI."""
+
+    contracts: list[ModuleContractSnapshot] = []
+    diagnostics: list[DashboardCollectionError] = []
+    for repo in repositories:
+        if not repo.exists or not repo.is_git:
+            continue
+        root = Path(repo.absolute_path)
+        for manifest in sorted(root.glob("src/**/backend/manifest.py")):
+            try:
+                contract = parse_manifest_contract(manifest, repo_name=repo.spec.name)
+            except Exception as exc:  # noqa: BLE001 - fail-closed UI diagnostic.
+                relative_source = manifest.relative_to(root).as_posix()
+                diagnostics.append(
+                    DashboardCollectionError(
+                        code="module_contract_unreadable",
+                        message=(
+                            "Module contract metadata could not be read or parsed "
+                            f"({type(exc).__name__})."
+                        ),
+                        remediation=(
+                            "Repair the manifest's Python syntax or read permissions, "
+                            "then refresh the dashboard before planning a release."
+                        ),
+                        repo=repo.spec.name,
+                        source=f"{repo.spec.name}/{relative_source}",
+                    )
+                )
+                continue
+            if contract is not None:
+                contracts.append(contract)
+    return tuple(contracts), tuple(diagnostics)
+
+
 def validate_contracts(contracts: tuple[ModuleContractSnapshot, ...]) -> tuple[CompatibilityIssue, ...]:
     """Validate the statically collected module interface graph.