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

packages/core/agent/src/dispatch.ts

@@ -1,14 +1,7 @@
 /**
- * Fused scope-carrier dispatch for agent-subject operations, plus the assembly
- * context builder. The sanctioned ordinary spelling is
- * `agentEvents(ctx, agent).waterfall('agent/request', …)`: it builds the scope
- * carrier ({@link scopeTarget} keyed by the agent) AND injects the subject as
- * the first argument in one move, so a site cannot name a different subject.
- * The registry lifecycle pair is the deliberate exception: `enter()` captures
- * one stable carrier before commit and `announce()`/detach dispatch through it
- * directly, so both lifecycle edges use the same routing identity. The dev
- * scoped-dispatch invariant checks both shapes.
- *
+ * Agent-scoped dispatch and prompt assembly helpers. Ordinary events use the
+ * fused dispatcher so subject and scope key cannot diverge; registry lifecycle
+ * code instead captures one stable carrier for both edges.
  * @module @deepseek-ai/dsh-agent/dispatch
  */
 
@@ -74,9 +67,7 @@ export interface AgentEventDispatch {
 }
 
 /**
- * Build the fused dispatcher for `agent`'s events (see the module doc). Cheap
- * (one carrier + one small object) — dispatch sites create it per run/turn
- * rather than caching it on the agent.
+ * Build a dispatcher that couples the agent subject to its scope carrier.
  * @param ctx - the context to dispatch through (any context of the app).
  * @param agent - the subject agent; also the scope-carrier key.
  * @returns the fused dispatcher.
@@ -121,11 +112,8 @@ export function agentEvents(ctx: Context, agent: Agent): AgentEventDispatch {
 }
 
 /**
- * The assembly context for one agent's prompt: the typed `agent` DX field and
- * the `scope` layer selector, set together (setting `agent` without `scope`
- * silently drops the agent's scoped sections/tools from the assembly — the
- * dev invariants flag it). THE way the loop (and any custom driver) builds
- * its per-step `ctx.systemPrompt.assemble(…)` input.
+ * Build the prompt assembly context with agent and scope set together, so
+ * agent-scoped prompt and tool contributions cannot be silently omitted.
  * @param agent - the agent the assembly is for.
  * @returns the context to pass to `assemble()`.
  */