diff --git a/docs/spec/07-implementation-phases-todo.md b/docs/spec/07-implementation-phases-todo.md
index 3d81439..014e7eb 100644
--- a/docs/spec/07-implementation-phases-todo.md
+++ b/docs/spec/07-implementation-phases-todo.md
@@ -369,3 +369,62 @@ Acceptance criteria:
 - exported data can be assigned back to the correct Revit objects
 
 PostgreSQL should be introduced when shared multi-user operation, background jobs or operational scale justify it. External-object count alone does not require an immediate migration.
+
+## Phase 14: Documentation and Collaboration Handoff
+
+Goal:
+
+After the legacy consumer path has been removed, provide one accurate entry point for developers, contributors and LLM-assisted work.
+
+Timing:
+
+- perform the final rewrite after legacy cutover so the documentation describes only the supported architecture
+- update documentation incrementally during earlier phases, but do not present transitional paths as the long-term design
+
+README target structure:
+
+- short project purpose and current maturity/status
+- supported domain workflow at a high level
+- technology stack
+- prerequisites
+- recommended Docker development quick start
+- direct local development start
+- test, type-check and build commands
+- database persistence, migration, backup and restore basics
+- production deployment/install instructions once a production setup exists
+- concise documentation map
+- contribution entry point
+
+README content to remove or relocate:
+
+- historical requirement checklists
+- file-by-file implementation status from early prototypes
+- obsolete legacy consumer architecture
+- long domain specifications already maintained in `docs/`
+- broken links and claims that are not verified by the current code
+
+Documentation tasks:
+
+- add a `docs/README.md` index with current, future and archived documents clearly separated
+- keep current architecture, domain invariants, API behavior and interaction behavior synchronized with code
+- archive superseded initial requirements under `docs/archive/` when they are still useful for traceability
+- remove obsolete documentation that has no remaining historical or operational value
+- update `AGENTS.md` with current entry points, supported/deprecated paths and forward architecture constraints
+- add a concise contributor workflow for branches, migrations, tests and commits
+- document how a colleague creates an empty local database and optionally loads safe sample data
+- avoid duplicating the same architecture facts across README, `AGENTS.md` and detailed docs; link to one source of truth
+
+Deployment documentation requirements:
+
+- distinguish development Compose from production deployment
+- do not label the hot-reload development stack as a production setup
+- document required environment variables, ports, health checks, persistent storage and migration behavior
+- verify backup and restore procedures
+
+Acceptance criteria:
+
+- a colleague can clone the repository and start a clean development environment using only the README
+- a contributor can identify the supported architecture and relevant code entry points without reading historical specs
+- an LLM receives domain invariants, current module boundaries and deferred architecture direction without relying on stale legacy files
+- every README command and internal documentation link is verified
+- production instructions describe a real tested deployment path or clearly state that none is supported yet