Merge remote-tracking branch 'origin/master' into xtr/react-loop-simplification

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.i18n.yaml
#	.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.md
#	.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.zh.md
#	.agents/notes/implemented/feature/2026-07-21-tui-skill-slash-command.i18n.yaml
#	.agents/notes/implemented/feature/2026-07-21-tui-skill-slash-command.md
#	.agents/notes/implemented/feature/2026-07-21-tui-skill-slash-command.zh.md
#	.agents/notes/implemented/simplification/2026-07-17-one-send-one-turn.i18n.yaml
#	.agents/notes/implemented/simplification/2026-07-17-one-send-one-turn.md
#	.agents/notes/implemented/simplification/2026-07-17-one-send-one-turn.zh.md
#	docs/architecture.i18n.yaml
#	docs/cordis-catalog/events.md
#	docs/cordis-catalog/services.md
#	docs/core-data-structures/core.i18n.yaml
#	docs/core-data-structures/core.md
#	docs/core-data-structures/core.zh.md
#	docs/defensive-patterns.i18n.yaml
#	packages/client/runtime/src/client/sessions/session.ts
#	packages/client/runtime/tests/queue-store.spec.ts
#	packages/context/time-context/tests/time-context.spec.ts
#	packages/context/workspace-context/tests/workspace-context.spec.ts
#	packages/cordis/tool-cordis/src/api-catalog.ts
#	packages/core/agent-loop/README.i18n.yaml
#	packages/core/agent-loop/README.md
#	packages/core/agent-loop/README.zh.md
#	packages/core/agent-loop/src/agent.ts
#	packages/core/agent/README.i18n.yaml
#	packages/core/agent/README.md
#	packages/core/agent/README.zh.md
#	packages/core/agent/src/types.ts
#	packages/core/agent/tests/agent.spec.ts
#	packages/core/scope/src/scoped-events.generated.ts
#	packages/goal/command-goal/tests/command-goal.spec.ts
#	packages/goal/goal-session/src/index.ts
#	packages/goal/goal-session/tests/goal-session.spec.ts
#	packages/goal/goal/tests/goal.spec.ts
#	packages/goal/goal/tests/projection.spec.ts
#	packages/goal/tool-goal/tests/tool-goal.spec.ts
#	packages/host/apiproxy/src/api-proxy.ts
#	packages/host/apiproxy/src/api/events.schema.ts
#	packages/host/apiproxy/src/api/events.ts
#	packages/host/apiproxy/tests/api-proxy-workspace.spec.ts
#	packages/llm/llm/README.i18n.yaml
#	packages/llm/llm/README.zh.md
#	packages/llm/llm/src/index.ts
#	packages/pty/pty-local/tests/index.spec.ts
#	packages/pty/pty-local/tests/local.spec.ts
#	packages/pty/pty/tests/service.spec.ts
#	packages/pty/tool-pty/tests/loader-composition.spec.ts
#	packages/pty/tool-pty/tests/tools.spec.ts
#	packages/skill/tool-skill/tests/tool-skill.spec.ts
#	packages/tasks/tasks-local/tests/tasks.spec.ts
#	packages/ui/tui/src/index.ts
#	packages/ui/tui/tests/harness.ts
#	packages/ui/tui/tests/tui.spec.ts
#	scripts/gen-cordis-catalog.ts
#	scripts/type-equiv.manifest.json

packages/core/agent/README.md

@@ -60,7 +60,9 @@ Turn and step boundaries and the model token stream are durable `session/event`
 
 The handle every plugin programs against:
 
-- `agent.followup(input)` — queue an ordinary follow-up turn and wake the driver. Each admitted item becomes the sole ordinary prompt in its turn; the [one-send-one-turn Agent Note](../../../.agents/notes/implemented/simplification/2026-07-17-one-send-one-turn.md) owns the turn rationale.
+- `agent.send(message, options)` — the one delivery primitive over the (`target` × `wakeup`) matrix. `message` is an already identified, frozen `UserMessage`; callers normally create it with `createUserMessage()` before routing begins. `SendOptions` owns only the `target` and `wakeup` policy. Each accepted FIFO occurrence receives its own `InboxItemId`, even when callers reuse a `MessageId`; `agent/inbox/enqueue`/`update` and the terminal `dequeue` or `discard` carry that complete `InboxItem`. `target: 'next-turn'` queues one independent FIFO item that, if admitted, becomes the sole ordinary prompt in its turn. `target: 'next-step'` with `wakeup: true` submits steering, while `target: 'next-step'` with `wakeup: false` injects durable context without running the model. The [one-send-one-turn Agent Note](../../../.agents/notes/implemented/simplification/2026-07-17-one-send-one-turn.md) owns the turn rationale.
+- `agent.updateInbox(itemId, action)` — synchronously edits or removes one still-pending queued occurrence. Edit keeps its `MessageId`, `InboxItemId`, source, and FIFO position while replacing frozen content; remove emits the occurrence's terminal discard. Steering and claimed occurrences return `not-found`.
+- `agent.followup(input)` — the `next-turn`/wakeup preset of `send()`: queue an ordinary follow-up turn and wake the driver.
 - `agent.steer(input)` — the `next-step`/wakeup preset: during prompt admission or an open turn, stage steering for the next safe boundary without dispatching `agent/prompt-submit`; outside that acceptance window, delegate to a woken follow-up. Admission failure leaves staged steering for retry or a later admitted prompt, while cancellation or disposal may discard it.
 - `agent.inject(input)` — the `next-step`/no-wakeup preset: append model-facing context without running the model; the next request sees a verbatim user-role message whose provenance is carried by the required `input.source`. During prompt admission or an open turn, injection waits in the outbox for the next safe boundary. Outside that acceptance window, it appends immediately without opening a turn; a context-only admission batch takes this fallback if admission closes without a turn, while context staged beside steering remains pending with it. Persistence reacts to `session/event` independently. Injection emits no `agent/inbox/*` event.
 - `agent.acceptsNextStep` — whether steering would currently join prompt admission or the open turn. Use this narrower routing predicate when a caller must choose between steering and a fresh admitted prompt; `status === 'running'` also covers admission exit and turn settlement.