Merge branch 'codex/simp-agent-entry-state' into codex/simp-unify-agent-session-id

# Conflicts:
#	docs/config-catalog.md
#	docs/cordis-catalog/services.md
#	docs/event-producer-consumer.md
#	docs/rfc/implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.md
#	docs/rfc/implemented/architecture/2026-06-20-branded-ids.md
#	docs/rfc/implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.md
#	docs/rfc/proposed/feature/2026-07-07-claude-code-and-codex-subagent-backends.md
#	docs/rfc/proposed/simplification/2026-06-20-unify-agent-and-session-id.md
#	packages/bash/tool-bash/README.md
#	packages/bash/tool-bash/src/index.ts
#	packages/bash/tool-bash/tests/tools.spec.ts
#	packages/core/agent-loop/README.md
#	packages/core/agent-loop/tests/properties.spec.ts
#	packages/core/agent/README.md
#	packages/core/agent/src/index.ts
#	packages/guard/repeat-tool-guard/src/index.ts
#	packages/hooks/hooks-claude/tests/bridge.spec.ts
#	packages/subagent/subagent-acp/tests/mock-acp-server.ts
#	packages/ui/acp/tests/dispose.spec.ts
#	packages/ui/stdio-agent/src/index.ts
#	packages/ui/stdio-agent/src/stdio-chat.ts
#	packages/ui/stdio-agent/tests/stdio-chat.spec.ts
#	packages/util/brand/src/index.ts

examples/cordis-agent/tests/cordis-tools.e2e.ts

@@ -78,10 +78,9 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('cordis tools: a real model modif
     }])
     await waitForIdle(ctx, agent)
 
-    // World checks: the tool exists in the registry, was invoked as a real
-    // tool call, and its RESULT (the self-made execute actually running) is the
-    // reversed string. The model's prose is not asserted — the tool result is
-    // the world; the summary sentence is just the self-report.
+    // World checks: the tool exists in the registry, was invoked as a real tool call, and its
+    // RESULT (the self-made execute actually running) is the reversed string. Model prose is only
+    // self-report and is deliberately not asserted.
     expect(ctx.tools.get('reverse_text')).toBeDefined()
     const events = [...agent.session.events]
     const calls = events.filter(event => event.type === 'tool/call')