Simplify stage and Audita contracts

docs/integrations/audita.md

@@ -15,7 +15,12 @@ runner composition is documented in
 - required transcript/glossary/output/work-dir paths;
 - optional report path (required when report mode is enabled);
 - generated config and stdout/stderr log paths;
-- optional module/model/base-url/config/output-schema/concurrency settings.
+- optional per-invocation module override.
+
+The constructed runner owns static Audita settings: binary, timeout,
+credentials, default modules, model and endpoint settings, validation and output
+settings, report mode, and concurrency. The `polish` stage supplies only
+invocation-specific paths and may override modules for that invocation.
 
 ## Result Contract
 `PolishResult` returns:

docs/internal/stage-polish.md

@@ -17,7 +17,8 @@ Run Audita polishing on base transcript and produce polished transcript.
 ## Key Behavior
 
 - resolves base transcript from merge outputs/canonical fallback.
-- invokes Audita with configured model/module/runtime options.
+- invokes an Audita runner configured with static model/runtime options; the
+  invocation supplies paths and modules.
 - validates processed transcript structure (`segments` array required).
 - validates optional report JSON.
 - materializes canonical outputs; records logs/generated config and adapter metadata.

docs/roadmap/implementation.md

@@ -1014,6 +1014,8 @@ stabilized and place static Audita policy in its constructor.
 tests, search for removed symbols/TODOs/stale request fields, and confirm public
 package documentation matches the remaining contract.
 
+**Status:** Completed.
+
 ## Stage 31 — Enforce CI validation and streamline the assembled test suite
 
 **Read first:** `audit-findings.md` lines 3822–3836 (TST-012) and 3869–3885