Complete Phase 19 Go rollout documentation

docs/rewrite-notes.md

@@ -29,9 +29,19 @@ The Go rewrite is complete when both of the following are true:
    - Strict stdout/stderr discipline for subprocess callers.
    - No hidden service dependency; the CLI remains the primary integration surface.
 
+## Final status (Phase 19 complete)
+
+The Go rewrite definition of done is met, with documented parity caveats tracked in `docs/python-parity.md`.
+
+- Phase 19 is complete.
+- Go Audita is the active implementation.
+- The default full module pipeline is implemented (`glossary,homophones,glossary,spoken_word,grammar`).
+- Parity fixtures and operational hardening coverage exist in normal `go test ./...`.
+- Python is retained as a legacy/reference implementation and is not the primary operational path.
+
 ## Current implementation status
 
-The Go rewrite now has feature-complete runtime behavior for the module pipeline plus Phase 18 operational hardening coverage.
+The Go rewrite is complete and feature-complete for the intended CLI runtime architecture.
 
 Implemented:
 - CLI command surface for `audita process`.
@@ -97,8 +107,11 @@ Implemented:
   - validation override behavior when validation fields are set.
 - Generic JSON diagnostics primitives for LLM interactions (request metadata, request payload, response payload, optional error payload) with secret redaction.
 
-Not yet implemented:
-- Phase 19 rollout and Python retirement/documentation transition work.
+Phase 19 documentation and rollout items are implemented:
+- Go-first README/build/test/usage guidance.
+- subprocess/orchestrator operational guidance.
+- Python-to-Go migration guidance.
+- explicit legacy/reference Python status documentation.
 
 ## Completed phases
 
@@ -234,10 +247,6 @@ Not implemented in Phase 8 (by design):
 - Prompt/response diagnostics runtime wiring.
 - End-to-end transcript polishing.
 
-## Remaining work plan
-
-Next recommended phase: **Phase 19 (documentation, rollout, and Python retirement)**.
-
 ## Phase 9: Structured LLM client and scheduler infrastructure
 
 ### Status
@@ -656,8 +665,8 @@ Implemented:
   - permit release on error/cancellation.
 - Added focused subprocess-caller operational guidance in `docs/subprocess-operations.md`.
 
-Intentionally deferred:
-- Phase 19 documentation/rollout/Python-retirement transitions.
+Historical note:
+- Phase 19 documentation/rollout/Python-retirement transitions were deferred at the end of Phase 18 and completed in Phase 19.
 
 ## Phase 19: Documentation, rollout, and Python retirement
 
@@ -689,9 +698,23 @@ The repository clearly presents the Go implementation as the active Audita imple
 - Users can build, test, and run the Go implementation from docs alone.
 - `go test ./...` passes.
 
+### Phase 19 completion status
+
+Completed.
+
+Implemented:
+- README is Go-first and documents active full-pipeline runtime behavior.
+- Build/install/test usage guidance is Go-primary and operationally oriented.
+- Subprocess/orchestrator behavior is documented in `docs/subprocess-operations.md`.
+- Migration guidance from Python to Go is documented in `docs/migration-from-python.md`.
+- Python parity notes and open parity gaps remain documented in `docs/python-parity.md`.
+- Python implementation status is explicitly legacy/reference in primary docs and `python/README.md`.
+- Documentation no longer routes normal operations to Python.
+- Normal `go test ./...` remains independent of real LLM credentials and Python dependencies.
+
 ## Cross-phase compatibility requirements
 
-These constraints apply to every remaining phase:
+These constraints were used across implementation phases and remain useful maintenance checks:
 
 - Preserve subprocess-safe stdout/stderr behavior.
 - Preserve CLI-over-env precedence.