Merge remote-tracking branch 'origin/master' into codex/trim-ai-prose

# Conflicts:
#	docs/AGENTS.md
#	docs/config-catalog.md
#	packages/bash/bash-sandbox/src/index.ts
#	packages/bash/bash/src/session-mode.ts
#	packages/bash/tool-bash/README.md
#	packages/code-runtime/code-runtime-worker/README.md
#	packages/compact/compact/src/index.ts
#	packages/core/agent-core/README.md
#	packages/hooks/hooks-claude/src/config.ts
#	packages/hooks/hooks-claude/src/index.ts
#	packages/hooks/hooks-codex/src/config.ts
#	packages/hooks/hooks-codex/src/index.ts
#	packages/llm/llm/README.md
#	packages/session-persistence/session-persistence-jsonl/README.md
#	packages/session-persistence/session-persistence/README.md
#	packages/skill/skill-local/README.md
#	packages/support/acp-snapshot/README.md
#	packages/support/invariants/src/index.ts
#	packages/ui/acp/README.md
#	packages/ui/jsonrpc-agent/README.md
#	packages/ui/jsonrpc/README.md
#	packages/ui/permission/README.md
#	packages/ui/user-approval/README.md
#	packages/ui/user-interaction/README.md
#	packages/web/web-search-deepseek/README.md

packages/session-persistence/session-persistence/README.md

@@ -47,3 +47,17 @@ Three backends run these suites: an in-memory reference (in `tests/`), `dsh-sess
 ## Metadata types
 
 Re-exported from `dsh-session`: `SessionHeader` (immutable session metadata: `version`, `id`, `createdAt`, `cwd?`, `parentSession?`, `seedLength?`).
+
+## Model Experience
+
+### Resumed conversation history
+
+**What the model sees**: This seam adds no prompt or schema. Resume restores stored surface events as message history; stored request headers reconstruct earlier calls, while the new loop composes the current system prompt, tools, and session prefix for its next request. Crash repair inserts exactly `Tool call interrupted by a crash; no result was recorded.` as the error result for each unanswered tool call.
+
+**Token effect**: Zero tokens during ordinary persistence. Resume restores retained history cost and pays the current request envelope normally; each repaired call adds the quoted retained error text.
+
+## Known Limitations and Deferred Work
+
+- **No deletion or retention surface** — the seam is `create`/`append`/`load`/`list` only; pruning stored sessions is out-of-band backend maintenance.
+- **`list()` is unpaginated and unfiltered** — it returns every stored session's header; fine for local stores, unindexed at scale.
+- **Repair-time synthetic closers are the only crash story** — a backend must synthesize `tool/result`/`step/end`/`turn/end` closers on load; there is no partial-turn resume that continues an interrupted turn instead of closing it.