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Merge remote-tracking branch 'origin/master' into worktree/web-multimodal-image-input

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# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-25-web-input-machine-and-slash-pipeline.i18n.yaml
#	docs/architecture.i18n.yaml
#	docs/core-data-structures/core.i18n.yaml
#	packages/client/runtime/README.i18n.yaml
#	packages/client/ui-conversation/src/client/apply.ts
#	packages/client/ui-conversation/src/client/chat/ChatView.tsx
#	packages/client/ui-conversation/src/client/skeleton/InputBar.tsx
#	packages/client/ui-conversation/tests/input-bar.spec.tsx
#	packages/client/ui-conversation/tests/input-matrix.spec.tsx
#	packages/client/ui-conversation/tests/input-scenarios.spec.tsx
#	packages/client/ui-conversation/tests/skeleton.spec.tsx
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Yichen Jiang
2026-07-28 16:07:58 +08:00
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@@ -139,13 +139,13 @@ Each agent owns scoped `agent.ctx`; shared storage overlays its tool, prompt, an
### Session Log
The session log is authoritative. `deriveMessages()` projects model history; raw `assistant/chunk` events preserve replay and UI fidelity. Fork, resume, transcript rendering, telemetry, and persistence derive from this stream.
The session log is authoritative. `deriveMessages()` projects model history; `assistant/chunk` preserves replay and UI fidelity. Fork, resume, transcript rendering, telemetry, and persistence derive from it.
**Model-visible ⟺ durably recorded**: `step/start`, session prefix, folded `request/header`, and logged immutable attachment references reconstruct requests. `dsh-agent-loop/invariant` asserts reconstruction through `ctx.invariants`; backends assert attachment-byte integrity ([decision](../.agents/notes/implemented/architecture/2026-07-05-reconstructable-requests.md)).
Durability is a plugin concern. Backends eagerly drain synchronous `session/event` notifications. `session/flush` barriers precede each request and top-level tool dispatch, then follow `turn/end` before another queued turn or idle observation. `SessionPersistence` stores `SessionEvent` directly and metadata in `SessionHeader`; JSONL defaults to checksummed Zstandard, while SQLite shares the contract ([decision](../.agents/notes/implemented/bug-fix/2026-07-21-semantic-session-checkpoints.md)).
Plugins own durability. Backends eagerly drain synchronous `session/event` notifications. `session/flush` barriers precede each request and top-level tool dispatch, then follow `turn/end` before another queued turn or idle observation. `SessionPersistence` stores `SessionEvent` directly and metadata in `SessionHeader`; JSONL defaults to checksummed Zstandard, while SQLite shares the contract ([decision](../.agents/notes/implemented/bug-fix/2026-07-21-semantic-session-checkpoints.md)).
`ctx.sessions.appendOutOfBand()` adds plugin-owned log-only events to an open turn or creates a balanced, flushed zero-step turn. `session/title` folds latest-wins with source seqs and provenance; its immediate fallback and sole optional async provider never delay response. Forks inherit titles ([decision](../.agents/notes/implemented/feature/2026-07-21-log-backed-session-titles.md)).
Log-only events may sit between turns. Owners append through `Session`, flushing only for durability. `session/title` relies on eager persistence and lifecycle drains. Latest title wins with provenance; fallback and provider work never delays responses. Such records are fork boundaries, so forks inherit titles ([decision](../.agents/notes/implemented/feature/2026-07-21-log-backed-session-titles.md)).
### Model Content