Route proposal modules through embedded PromptKit definitions

docs/roadmap/implementation.md

@@ -312,7 +312,16 @@ PromptKit's entire status-code matrix.
 
 ## Stage 6: Migrate All Proposal Callers
 
-**Status:** Pending. **Depends on:** Stage 5.
+**Status:** Complete (2026-09-24). All four modules select embedded prompt IDs
+and share domain variable encoding; proposal generation passes the correction-set
+key and diagnostic context through the prepared client, retaining ordering,
+warnings, and later domain validation. Updated proposal and module tests and
+module internals documentation. The isolated variable-encoding test passed with
+`go test internal/framework/proposal_generation/variables.go internal/framework/proposal_generation/variables_test.go`;
+`git diff --check` passed. Assembled proposal/module tests are deferred because
+Stage 7's validator imports still reference removed message-rendering types.
+The repaired-proposal/domain integration check remains deferred with those imports.
+**Depends on:** Stage 5.
 **Owns:** `internal/modules`, `internal/framework/proposal_generation`, and their tests.
 
 1. Switch glossary, homophones, spoken_word, and grammar proposal construction to