feat(recovery,context): tier-2 intent-holder arbiter + remaining-delta pinning + surfaced signal events

- recovery: two-tier repair ladder — owner then arbiter (recovery stage recast
  as intent-holder, holds initial intent, reconciles cross-file contract disputes)
  with independent INTENT_ROUTE_BUDGET; RecoveryRoutingTest coverage
- context: remaining-delta checklist pinning (RemainingDelta{Pinning,Entry}Test)
- surface write-only events (session name, quality signals) into stats/browse
- parseToolArguments lenient-Json fallback for bare-key drift
- tools: ChildProcess seam

testing/deterministic/src/test/kotlin/TalkieFacadeTest.kt

@@ -762,6 +762,8 @@ class TalkieFacadeTest {
                 impl.onUserInput(sessionId = sessionId, input = input, mode = chatMode)
             override suspend fun narrate(sessionId: SessionId, trigger: com.correx.core.talkie.model.NarrationTrigger) =
                 impl.narrate(sessionId = sessionId, trigger = trigger)
+            override suspend fun nameSession(sessionId: SessionId, intent: String) =
+                impl.nameSession(sessionId = sessionId, intent = intent)
         }
     }