Add runtime validation gate and known issues baseline

docs/testing.md

@@ -229,3 +229,50 @@ This validator checks text-based effect assets in `Effect`:
 - `.msf` `BombEffect`
 - `.msf` `AttachFile`
 - derived `.mss` sound scripts and their referenced `.wav` files
+
+Runtime release gate:
+
+```bash
+python3 scripts/validate_runtime_gate.py \
+  --runtime-root /tmp/m2dev-client-runtime-http
+```
+
+Strict runtime release gate:
+
+```bash
+python3 scripts/validate_runtime_gate.py \
+  --runtime-root /tmp/m2dev-client-runtime-http \
+  --strict-known-issues
+```
+
+The gate runs these validators together:
+
+- `scripts/validate_runtime_scenarios.py`
+- `scripts/validate_actor_scenarios.py`
+- `scripts/validate_effect_scenarios.py`
+
+By default they load the shared baseline:
+
+- `known_issues/runtime_known_issues.json`
+
+Result semantics:
+
+- `known_issue_ids`: currently accepted historical content issues
+- `unexpected_issue_ids`: new issues that fail the gate
+- `stale_known_issue_ids`: baseline entries not observed anymore
+
+Default behavior:
+
+- known issues are reported but do not fail the gate
+- only unexpected issues fail the gate
+
+Strict behavior:
+
+- unexpected issues fail the gate
+- stale known-issue entries also fail the gate
+
+Current baseline on the real runtime:
+
+- `world`: `0`
+- `actor`: `5`
+- `effect`: `12`