Enforce bounded operation guardrails

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a028de-e2c8-7732-8521-46a7fc5db82f

docs/adr/adr-004-producer-trust-boundary.md

@@ -103,7 +103,7 @@ Implemented in `src/activity_core/rules/executor.py`:
   pretty-printed and NDJSON output, attempts a best-effort `_try_repair` on a
   truncated tail, validates each recovered object against the item schema, and
   keeps the valid ones. Survivors are emitted with `output_validated=true`,
-  `partial=true`, and `review_required=true`.
+  `partial=true`, and `review_advisory=true` (`review_gate_applied=false`).
 - **Producer guardrails (`_partition_items`, applied on both the recovery and the
   happy path).** Per recommendation: structural type → schema → structural caps
   (`_MAX_DEPTH`, `_MAX_STRING_LEN`) → reference allow-list → count cap (top-N by