Merge remote-tracking branch 'origin/master' into codex/session-scoped-sandbox-roots
# Conflicts: # examples/acp-agent/tests/acp.snapshot.ts # packages/examples/agent-spine-demo/package.json # pnpm-lock.yaml
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@@ -19,6 +19,8 @@ Two families enforce the same mode vocabulary: the sandboxed bash executor (`@de
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- `setSandboxMode(session, mode)` — THE write path for a per-session override: appends exactly one `sandbox/mode` event. The switch IS its event; nothing mutates the mode out of band.
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- `SANDBOX_MODES` — every mode, for option advertisement and runtime validation.
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The optional `./invariant` companion rejects a forged durable `sandbox/mode` event whose value falls outside that closed vocabulary; Session and its companion own the surrounding storage and turn-enclosure rules.
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## The per-session store
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A runtime switch (an ACP `session/set_config_option`, a test scenario) is one log-only `sandbox/mode` event on the session it applies to. `effective = explicit grant ?? fold(events) ?? deployment default`, so an override survives restart by replay and two sessions never see each other's state. Workspace identity does not need another event: the immutable `SessionHeader.cwd` recorded at creation is the root for every call in that session. The event is log-only (the `approval/*` precedent): the model learns the mode from the enforcing tools' denial markers, never from the event.
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