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## Why `ThreadSessionState` is the TUI's cached view of an app-server session. To make `PermissionProfile` the canonical runtime permissions model, cached thread sessions need to always have a profile instead of treating the profile as an optional supplement to a legacy `sandbox` response field. The main compatibility concern is older app-server v2 lifecycle responses that only include `sandbox` and omit `permissionProfile`: - `thread/start` -> `ThreadStartResponse.sandbox` - `thread/resume` -> `ThreadResumeResponse.sandbox` - `thread/fork` -> `ThreadForkResponse.sandbox` Those responses must still hydrate correctly when the TUI is pointed at an older app-server. This PR converts the legacy `sandbox` value into a `PermissionProfile` immediately at response ingestion time, using the response `cwd`, so cached sessions do not carry an optional profile that can later reinterpret cwd-bound grants against a different thread cwd. This fallback is intentionally boundary compatibility. The follow-up PRs in this stack continue the cleanup by making `SessionConfiguredEvent` profile-only, deriving sandbox projections from snapshots only when an API still needs them, and then removing `sandbox_policy` from `ThreadSessionState`. ## What Changed - Makes `ThreadSessionState.permission_profile` required. - Converts legacy app-server response `sandbox` values into a `PermissionProfile` at ingestion time using the response cwd. - Ensures `thread/read` hydration does not reuse a primary session profile that may be anchored to a different cwd; it uses the active widget permission settings for the read thread fallback instead of reusing cached primary-session permissions. - Keeps the app-server request path unchanged: embedded sessions send profiles, while remote sessions continue using legacy sandbox overrides for compatibility. ## Verification - `cargo test -p codex-tui thread_read --lib` - `cargo test -p codex-tui permission_settings_sync_preserves_active_profile_only_rules --lib` - `cargo test -p codex-tui resume_response_restores_turns_from_thread_items --lib` - `cargo test -p codex-tui thread_session_state::tests --lib` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/19773). * #19900 * #19899 * #19776 * #19775 * #19774 * __->__ #19773