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docs/IMPLEMENTATION_PLAN.md

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+# GovOPlaN Distribution Lists Implementation Plan
+
+## Milestone 0: Module Seed
+
+Goal: establish repository identity, module boundary, and installable manifest.
+
+Tasks:
+
+- [x] initialize repository type and package metadata
+- [x] document boundary between address lists, distribution lists, and Umlauf
+- [x] add a no-op module manifest with durable documentation topics
+- [ ] create Gitea issues for the implementation milestones
+
+## Milestone 1: Contract And DTOs
+
+Goal: define mixed recipient entries without implementing every provider.
+
+Tasks:
+
+- define distribution-list, entry, expansion-plan, and expansion-result DTOs
+- define source reference format for address, identity, organization, group,
+  function, role, raw, and nested-list entries
+- define policy/read-only explanation payloads
+- define snapshot evidence shape
+- add cycle detection and expansion-limit semantics
+
+## Milestone 2: Local Distribution Lists
+
+Goal: implement local, manually maintained distribution lists.
+
+Tasks:
+
+- add database tables and migrations
+- add CRUD routes and permissions
+- add local raw email/postal entries
+- add references to address contacts and address lists via capabilities
+- expose `distLists.source` and `distLists.expand`
+- add tests for expansion and snapshots
+
+## Milestone 3: Provider Integrations
+
+Goal: allow distribution lists to resolve through installed modules.
+
+Tasks:
+
+- integrate with `addresses.lookup` and address-list source capability
+- integrate with identity/principal resolution
+- integrate with organizations/groups/functions once those modules expose
+  provider capabilities
+- preserve module independence when optional providers are absent
+
+## Milestone 4: UI
+
+Goal: make distribution lists practical for administrators and operators.
+
+Tasks:
+
+- add list management UI
+- add mixed entry editor with provider-specific search
+- show disabled/read-only entries with hover explanations
+- show expansion preview and stale-source warnings
+- expose picker components to campaign, mail, postbox, notifications,
+  scheduling, poll, and workflow consumers
+
+## Milestone 5: Umlauf Integration
+
+Goal: support administrative circulation workflows without confusing list
+definition with execution.
+
+Tasks:
+
+- let workflow/tasks consume distribution-list expansion snapshots
+- support ordered participant sequences where workflow owns state
+- add escalation and substitution hooks through workflow, not distribution lists
+- preserve immutable recipient evidence for every execution