## Why
Concurrent Guardian samples can finish out of order, allowing an older sample to
replace the thread's newer in-memory security risk score.
## What changed
- Record when each `SecurityRiskScore` sample starts while preserving compatibility
with records that have no timestamp.
- Add `ExtensionData::insert_if` so checking and replacing a typed attachment happen
under the same lock.
- Update Guardian V2 to replace the thread's risk score only when the completed sample
is newer than the stored one.
## Testing
- Verify concurrent conditional inserts retain the newest value.
- Verify Guardian-generated risk scores include a sampling timestamp.
GitOrigin-RevId: 6543a4e5497da4c623331050789e91613f931c4b
## What changed
Measure thread storage before and after `codex migrate-rollouts --apply` and
include the formatted sizes in the human-readable migration report. The total
includes active and archived rollout files, the thread history database, and
its WAL and shared-memory sidecars.
Keep dry-run and JSON output unchanged, and omit the storage summary if either
measurement fails.
GitOrigin-RevId: 1775c0b6849570a814becd94e196dd05908667a1
## What changed
- Add a thread-scoped extension API for requesting automatic review, resolving
multiple contributors to the strongest requirement.
- Have Guardian v2 request automatic review when it is enabled and the latest
`action_risk` score is at least `0.8`.
- Honor extension review requirements across tool approvals, MCP elicitation,
and remote execution while preserving host configuration and managed-policy
constraints.
## Testing
- Cover contributor registration and requirement resolution.
- Verify Guardian v2 requests review at the threshold, returns to the default
below it, and does not affect threads where the extension is disabled.
- Exercise extension-requested strict review with a remote model override.
GitOrigin-RevId: 6329fc23585d5cc7173c39bb9952c3109ec3884b
## What changed
- Invoke `ToolLifecycleContributor::on_tool_start` only after pre-tool hooks
have finalized the invocation.
- Pass hook-rewritten arguments and the post-hook conversation snapshot to the
callback.
- Skip the start callback when a hook denies execution or supplies input that
cannot be applied.
## Testing
Add lifecycle tests covering rewritten input, hook-added context, denied tool
calls, and invalid rewritten input.
GitOrigin-RevId: 936efaf4a8c35321f9982ff2a33bb8bece1ebf39
## What changed
- Replace the single `category` and `score` fields in `SecurityRiskScore` with a
deterministic map of category names to scores.
- Validate the full Guardian V2 classifier response before storing it as one
thread extension value and, for non-ephemeral threads, one rollout item.
- Cover serialization and rollout loading with snapshots containing multiple
score categories.
GitOrigin-RevId: 24525de691f96bd34ccfe04acab2f01aca309837
## Why
Guardian V2 classification requests should retain compacted conversation context only when the parent and classifier model configurations can share the encrypted compaction.
## What changed
- Resolve the classifier model's compaction compatibility hash when initializing its sampler.
- Add the latest encrypted parent compaction to classification input when both models have the same non-empty compatibility hash.
- Ignore missing, empty, or unidentified compactions, and omit parent context when compatibility cannot be established.
## Testing
- Cover latest-compaction selection and invalid compaction data.
- Cover matching, mismatched, missing, empty, and changed compatibility hashes.
GitOrigin-RevId: f0fcb09fd028cd2f397fdbc3d541b4bc464b0beb
## Why
Filesystem helpers only need access to their own executables. Granting access to
the containing directories also makes unrelated sibling files readable.
## What changed
- Allow filesystem helpers to read the Codex and Linux sandbox executables
directly instead of their parent directories.
- Give macOS filesystem helpers a narrower Seatbelt profile that omits the
normal process sandbox's `/Applications` read access.
- Preserve the existing platform defaults for normal sandboxed processes.
## Testing
Add unit and integration coverage for direct and symlinked sibling-file access,
sandboxed copies, allowed workspace reads, and the macOS-specific Seatbelt
profiles.
GitOrigin-RevId: 9380c6868a695bdf2275baa74bd5e8a30a64ba1b
## What changed
- Replace the single byte limit with token-derived per-entry and separate message and tool transcript budgets.
- Preserve the first and latest user messages, then fill the remaining budgets with recent user, assistant, and tool context while limiting retained non-user entries.
- Truncate oversized entries in the middle without splitting UTF-8 characters, and report the approximate omitted token count.
- Exclude reasoning from the default transcript sources while retaining support when it is explicitly configured.
## Testing
- Cover oversized message and tool-result truncation, user-message retention, separate tool budgeting, configured reasoning, and the resulting Guardian sampling request.
GitOrigin-RevId: aaeaa5fb5d902b5a1581a8a819bf34724bde794b
## What changed
- Represent Guardian sampling input as an ordered list of text entries.
- Send each transcript entry and approval-request delimiter as a separate input
content item while preserving the existing transcript byte limit.
## Testing
- Update transcript and sampler tests to verify entry boundaries, multi-item
request serialization, and bounded transcript behavior.
GitOrigin-RevId: 433e2e6ca18ce9288025715f5956295bfe852e98
## What changed
- Register Guardian V2 for thread startup as well as tool-call lifecycle events.
- When `guardianv2` is enabled, create and store a thread-local Luna sampler using the thread's model provider, authentication policy, session metadata, originator, and service tier.
- Emit a warning if sampler initialization fails, and skip tool classification when the thread has no sampler.
## Testing
- Update the extension test to enable `guardianv2`, run thread startup, and verify tool-call sampling through the initialized connection.
GitOrigin-RevId: 5ab732e85c9827495c67f57117eb5be450a7f90e
## What changed
- Parse and validate the structured risk scores returned for each classified tool call.
- Publish each score through thread extension data and persist it in rollout history for non-ephemeral threads.
- Report parsing, thread lookup, validation, and persistence failures through the extension warning sink.
## Testing
- Extend the Guardian V2 tool-classification test to verify that the sampled `action_risk` score is available from thread extension data and written to rollout history.
GitOrigin-RevId: 46614fe0d686736dfb1f09398c6fcd848c7d8b2c
## What changed
- Opt Guardian V2 Luna sampler WebSocket connections into responses lite.
- Send `reasoning.context` as `all_turns` on sampling requests.
## Testing
- Extend sampler and extension tests to verify the connection header and reasoning context.
GitOrigin-RevId: 4b0263c01b8259ed5268c222dcf7559912baba8c
## What changed
- Add `EnvironmentConfigState` to `TurnEnvironmentSelection` so each environment attachment can inherit thread configuration or carry ready configuration for its login-shell policy and selected capability roots.
- Apply ready configuration during thread creation and thread-settings updates while reusing the existing environment connection.
- Validate selection configuration before applying settings, rejecting unsupported pending state and invalid capability roots.
## Testing
- Cover attachment-scoped capability roots, ready configuration at thread startup and turn updates, and rejection of invalid selections without changing existing settings.
GitOrigin-RevId: 86cf8f2148fdaa746ea0dd12890ab7b1577d7587
## What changed
- Set `parallel_tool_calls` for regular and remote compaction prompts without consulting model metadata.
- Remove `supports_parallel_tool_calls` from `ModelInfo`, the bundled model catalog, and related fixtures.
- Preserve the existing Responses Lite behavior that disables parallel tool calls at request construction.
GitOrigin-RevId: 49552bdf97e71fa57325abb49f8adc0c88f1401a
## Why
Bazel builds did not embed the SHA-256 digest used to verify the bundled
`bwrap` binary at launch.
## What changed
- Strip the Bazel-built `bwrap`, generate its SHA-256 digest, and pass that
digest to `codex-linux-sandbox` through a compiler environment file.
- Report digest verification failures with exit code `8` instead of panicking.
- Add a Bazel integration test that accepts the original bundled binary and
rejects a tampered copy.
GitOrigin-RevId: 224eeb6ae3d1bfb100e048b296f75fd8ba109581
## Why
MCP runtime reconciliation can occur while an unchanged server is still
starting, such as when capability roots become available. Reconciliation
should neither wait for that startup nor initialize the same server again.
## What changed
- Reuse an active, uncancelled pending MCP connection when its identity,
catalog limit, and protocol mode still match.
- Publish the shared startup result through the reconciled server view while
applying its updated tool filter.
- Preserve cancellation when a reused pending server is subsequently removed.
## Testing
Added coverage for filtered-tool publication, disabling a reused pending
server, and capability-root reconciliation during Codex Apps startup.
GitOrigin-RevId: 690cf8695e75b341d097d7d22b5da6993b24e787
## What changed
- Route MCP tool calls through the automatic reviewer when strict auto-review is enabled, even when the approval policy, tool annotations, or a remembered session decision would otherwise skip review.
- Pass the strict auto-review flag into the MCP approval request so reviewer selection follows the turn setting.
- Update MCP approval and turn-metadata tests to cover the forced review path and confirm that it does not request user input.
GitOrigin-RevId: 2c0b5f4dc1a15cb2fb827e4b21e69167fdcf3e56
## What changed
- When an explicitly selected plugin has apps available, instruct the model to use `tool_search` to discover relevant tools before falling back to unrelated or built-in tools.
- Scope the guidance to the request that selected the plugin and omit it for plugins without available apps.
## Testing
- Cover app-specific rendering, non-app plugins, bounded instruction output, and app enablement in dual-surface plugin requests.
GitOrigin-RevId: 1b9501cc403d2817334a9307e683e99c140a794a
## What changed
- Add the canonical agent path as `agent_name` in Responses API turn metadata.
- Fall back to `/root` when a session has no canonical agent path.
- Reserve `agent_name` from client metadata overrides and omit it from MCP request metadata.
## Testing
- Cover root, named subagent, legacy subagent, MCP, and client metadata merge cases.
GitOrigin-RevId: a9adcc079a51beae7d621aba24bcd759ceaa408e
## What changed
- Add `SkillModelDelegationInstruction` for skills that request Luna while running on Sol or Terra.
- Resolve Luna only when it is available in the current provider namespace.
- Bound and validate model identifiers, skill names, and the rendered instruction before exposing it to callers.
## Testing
- Cover supported parent models, provider namespace matching, unavailable or unsafe targets, instruction rendering, and size limits.
GitOrigin-RevId: 188a88c36ca32689cbf1e53465283dff4137cb15
## What changed
- Replace accepted-line fingerprint generation with diff-based added and deleted line counts.
- Keep `line_fingerprints` in the analytics payload as a statically empty field for schema compatibility.
- Remove the fingerprint types and public parsing API that are no longer used.
## Testing
- Update diff parsing tests to cover accepted-line counts without generating fingerprints.
GitOrigin-RevId: 4247c76c7b56b1a323f70f960823937352b84f7b
## What changed
- Add the built-in `amazon-bedrock-runtime` provider for regional
`bedrock-runtime` OpenAI-compatible endpoints.
- Use endpoint-specific SigV4 service configuration while preserving bearer
token auth and per-provider AWS profile, region, and transport overrides.
- Provide global and US cross-region GPT-5.6 model variants, prefer global
routing for fallback and background tasks, and disable unsupported web search.
## Testing
- Cover provider configuration and capabilities, endpoint and auth selection,
runtime catalog ordering, model fallback, and web search omission.
GitOrigin-RevId: d158ab74a5768e1b4c61063365a0c06735313322
## What changed
- Add an optional `model` field to parsed and loaded skill metadata.
- Recognize `model: luna` while ignoring unsupported model values without
preventing the rest of the skill metadata from loading.
## Testing
- Cover supported, absent, unsupported, and repaired frontmatter model values.
GitOrigin-RevId: 376b65555e81d29a5eae93cc4c2633aacf7cd7c8
## Why
The connection that requested `thread/revert` may close while the thread is
being reloaded, but the replacement listener still needs to serve the thread's
existing subscriptions.
## What changed
Restart the listener task from the preserved thread state after a paginated
thread reload instead of attaching it through the requesting connection.
GitOrigin-RevId: 603ec3331c59bdde48faa2f4cb0fd1032ec8dbd8
## What changed
- Store `TurnEnvironmentSelection` directly on each resolved `TurnEnvironment`
instead of copying its environment ID, working directory, and workspace roots
into separate fields.
- Update environment resolution, tool execution, approvals, and related tests to
access selection state through the retained value.
GitOrigin-RevId: ab723d21e112b8af5bcaf1f772a5e376553312bc
## What changed
Implement `From<AbsolutePathBuf>` for `FileSystemPath` and use the conversion
when constructing concrete filesystem permission paths.
GitOrigin-RevId: 244bcbd0c3f76cd87cc1240458fcac6c9ef0a8e3
## What changed
- Add experimental `thread/queue/add`, `list`, `update`, `delete`, `reorder`, and `start` requests for persistent queued user submissions.
- Automatically dispatch queued submissions in FIFO order after completed or failed turns, while leaving the queue paused after interruption.
- Emit `thread/queue/changed` notifications and expose paginated queue contents with stable submission and client message IDs.
- Export the new protocol types through the generated JSON Schema and TypeScript bindings.
## Testing
- Add app-server integration coverage for capability gating, CRUD, pagination, capacity limits, notifications, automatic dispatch, cold-thread resume, interruption, and explicit queue starts.
GitOrigin-RevId: 89caf5577192199bda77cf6c372a59d26cdd910e
## What changed
- Preserve valid image content from completed `node_repl` Code Mode responses alongside text evidence for Guardian reviews.
- Enable multimodal evidence for models that require automatic `node_repl` review, or when both `guardian_enhanced_node_repl_transcripts` and `guardian_node_repl_transcript_images` are enabled.
- Bound retained and rendered evidence, deduplicate images already present in review history, and fall back to text-only evidence when the reviewer lacks image support or prompt capacity.
- Keep review evidence out of the parent turn input.
## Testing
- Cover feature gating, mixed text and image ordering, truncation and eviction, unsupported reviewers, prompt pressure, image detail normalization, and reused review sessions.
GitOrigin-RevId: a3e482402f7b3484401b231dadc662e6e3504fdf
## Why
`rules_rust` drops the build script's per-binary linker directives, so Bazel
builds can omit the `asInvoker` manifest from the Windows sandbox setup helper.
## What changed
- Add per-binary compile data and Rust flags to `codex_rust_crate` so linker
inputs remain scoped to the setup helper.
- Embed the manifest directly for MSVC builds and compile it into a resource
with hermetic LLVM tooling for GNU/LLVM cross-builds.
- Disable the redundant build script under Bazel and avoid duplicating binary
runfiles in integration test data.
## Testing
Add a Windows integration test that loads the setup executable's manifest
resource and verifies that it requests `asInvoker` execution with UI access
disabled.
GitOrigin-RevId: a77e7e627ee43810f5eaf7701bb4909bf855216b
## What changed
- Parse the optional `retirement_at` RFC 3339 value from model upgrade metadata, treating missing, null, or malformed values as unknown.
- Expose known retirement times from `model/list` as nullable Unix timestamps in `upgradeInfo.retirementAt` and preserve them when converting app-server models back into model presets.
- Update the generated protocol schemas and app-server documentation.
## Testing
- Cover absent, null, valid, and malformed catalog values.
- Verify `model/list` serialization and app-server model conversion for known, missing, and out-of-range timestamps.
GitOrigin-RevId: 969baf9f5b012997f460fb4611ba63c963ee658c
## What changed
- Add `oauth.callback_port` to MCP server configuration and preserve it when
serializing configuration edits.
- Accept `oauth.callbackPort` from plugin MCP declarations and skill dependency
metadata.
- Prefer the server-specific callback port over `mcp_oauth_callback_port` for
CLI login, app-server, plugin installation, executor, and skill dependency
OAuth flows.
## Testing
- Cover configuration parsing, serialization, and fallback behavior.
- Verify plugin, executor, and skill OAuth registrations use their configured
callback ports instead of the global port.
GitOrigin-RevId: 7f65e5e7869358307e49779f1b75e8672b607736
## What changed
When `Ctrl-C` is pressed with an empty composer while a task is running in a local daemon session, show a menu that lets the user:
- cancel the task and stay in Codex;
- exit Codex while leaving the task running; or
- stop the task and exit Codex.
Do not offer background execution for side-thread tasks or when follow-up messages are queued. Preserve existing `Ctrl-C` behavior for non-daemon sessions, drafts, paste bursts, MCP startup, and returning from an active side thread.
## Testing
Add TUI tests for each exit action, menu dismissal, side threads, queued follow-ups, composer input, MCP startup, and non-daemon sessions.
GitOrigin-RevId: 539c33d3a4ff288a015bddbe9465d2bbdbe018d0
## What changed
- Exclude current-time reminder developer messages when copying parent history into a full-history subagent.
- Keep the child's newly generated reminder, preventing inherited reminders from accumulating while preserving the rest of the forked context.
## Testing
- Extend the full-history V2 spawn test to verify that two reminders in the parent become one fresh reminder in the child request.
GitOrigin-RevId: fb61c72f7f0d61d1068f2c599a8b8caf1788b7e2
## Why
Client-authored developer instructions should remain available after a context
window is compacted when `retain_client_developer_messages` is enabled.
## What changed
- Preserve annotated client-authored developer messages during remote compaction
v2 and local token-budget context resets.
- Apply the existing retained-message token budget when carrying those messages
into the new context window.
## Testing
- Cover enabled and disabled retention for remote compaction v2, manual
token-budget compaction, and mid-turn automatic compaction.
GitOrigin-RevId: 4cb3782cb86ef46458413a17a3255d0016fd675f
## What changed
- Wrap injected current time reminders in `<current_time_reminder>` tags.
- Keep direct `clock.curr_time` tool output and log previews as plain text.
## Testing
- Update core and app-server coverage for tagged reminders and untagged tool output.
GitOrigin-RevId: ad27f1fa10cca7f83d1ac731e01255320bb60f47
## Why
Guardian V2 needs the requested action and its conversation context to assess
risk; a tool name and call ID alone do not describe what the tool will do.
## What changed
- Expose the original, pre-hook `ToolPayload` to tool lifecycle contributors.
- Build Guardian V2 classifier input from the bounded conversation transcript
and a structured planned-action object containing the tool name and arguments.
- Warn and skip classification if the planned action cannot be serialized.
## Testing
- Verify lifecycle contributors receive tool arguments.
- Verify Guardian V2 sends transcript history and planned-action JSON to the
classifier.
GitOrigin-RevId: 28266ef7c1d2267ba705fcfbd9be4ef48e64e104
## What changed
- Add the experimental `thread/revert` request, which replaces a loaded paginated thread's durable history with the prefix before `beforeTurnId` while preserving the thread ID.
- Interrupt any active turn, reload the replacement history without unloading the thread, preserve mutable thread settings, and emit `thread/reverted`.
- Return backward pagination cursors for the retained turns and items, reject stale rollout paths after a revert, and document that local file changes are unaffected.
## Testing
- Cover history replacement, pagination, stale paths, missing turns, subsequent turns, active-turn interruption, and preserved thread settings.
GitOrigin-RevId: 435a8163ad4f310cc47219b436f6bdde21f2b83a
## What changed
- Keep the configured `approvalPolicy` when a model in
`auto_review.required_on_models` selects the `auto_review` reviewer.
- Continue downgrading full-access sessions to workspace-write and rejecting
incompatible reviewer overrides.
## Testing
- Cover supported approval policies across thread start, settings updates,
turn-time model switches, resume, and fork flows.
GitOrigin-RevId: 2bd3e2dcd46f3cadeb2fad20222cf8917c267208
## Why
Local MCP requests can fail when the platform TLS backend cannot negotiate a
protocol version with an HTTPS endpoint.
## What changed
- Retry replayable local MCP requests once with rustls after a recognized TLS
protocol-version negotiation failure. Keep certificate, timeout, and unrelated
connection failures on the existing error path.
- Remember successful fallback per HTTPS origin and outbound route, while keeping
the platform TLS backend as the default for other destinations.
- Share the fallback-enabled client across local MCP resolution, CLI login, and
OAuth discovery while preserving remote environment HTTP clients.
## Testing
Added coverage for platform-specific error detection, request replay, cached
fallback reuse and isolation, non-replayable requests, redirects, and remote MCP
client selection.
GitOrigin-RevId: 39a2d96fdb2ea0e51df14f652ba2a953d24e69a1
## What changed
- Use the specialized Node REPL approval guidance only when the parent turn's
model sets `node_repl_auto_review_required`.
- Keep Node REPL JavaScript requests on the generic approval prompt otherwise.
- Cover both prompt paths in the Guardian tests.
GitOrigin-RevId: e3eb89a59cc74fe2b53bb1c3f29a30d450e173de
## Why
The model provider does not reliably identify which curated plugin catalog is
available. ChatGPT authentication can be used with a custom provider, while an
unauthenticated session should use the API-compatible catalog regardless of its
provider.
## What changed
- Select the ChatGPT curated catalog only for authentication modes that use the
Codex backend; use the API curated catalog for API-key and unauthenticated
sessions.
- Initialize standalone plugin managers with the current authentication mode
across CLI, app-server, MCP, and external-agent migration paths.
- Preserve authentication mode while detecting and importing migrated plugins.
## Testing
- Cover catalog and skill routing across ChatGPT, API-key, unauthenticated,
Bedrock, and custom-provider configurations.
- Verify authenticated plugin migration uses the ChatGPT curated marketplace.
GitOrigin-RevId: 660a339ee8891c33aad961078d3a979242a6a166
## Why
JavaScript executed through the Node REPL can invoke connected MCP, browser,
or computer-use tools, so reviewing only the outer tool call does not capture
its immediate effects.
## What changed
- Add dedicated Guardian review guidance for `node_repl` `js` requests that
evaluates nested calls, authorization boundaries, staged data, and concrete
side effects.
- Keep the existing generic approval prompt for other MCP tools and shell
requests.
## Testing
- Cover the dedicated Node REPL prompt, retry reasons, serialized request data,
and the generic fallback behavior.
GitOrigin-RevId: bf8d49d7e3dc3d36aa41b6b56ff8a0eb02da3e53
## Why
Workload identity credentials are owned by the app-server host and must not be replaced, removed, or exported through client account operations.
## What changed
- Reject account login and logout RPCs while workload identity is selected.
- Continue reporting the active authentication method from `getAuthStatus`, but omit the host-owned token even when `includeToken` is requested.
GitOrigin-RevId: 750c9d07ed2f4ba7007bbe75f188573e79749647
## What changed
- Treat workload identity environment markers as an explicit authentication selection, even when another process credential is present.
- Return initialization errors from `AuthManager` and propagate them through commands and services instead of continuing with an unusable authentication state.
- Make `codex login status` validate workload identity, keep the TUI on an embedded app server for local workload identity, and reject workload identity in `codex mcp-server`, where it is unsupported.
## Testing
- Cover workload identity precedence and partial configuration errors.
- Verify login status reports an unreadable identity assertion and app-server routing enforces the supported workload identity topology.
GitOrigin-RevId: efc6b6b4cd4d61652617de82aaa3d7ffc75d6618
## What changed
- Make `ThreadEnvironments` the source of truth for live environment selections and use it when building configuration snapshots, permission profiles, per-turn configuration, and MCP refresh inputs.
- Keep settings previews side-effect free while applying accepted environment updates consistently to subsequent turns.
- Move `EnvironmentConfig` into `codex-protocol` so environment ownership no longer depends on a core-only type.
## Testing
- Cover environment previews and snapshots, accepted and rejected steer updates, and active-turn environment stability.
GitOrigin-RevId: 7bcf8fb5df1215f720e4e9c419541a51a871aa5e
## Why
Transient executor disconnects could leave capability discovery and skill catalogs
stuck on a cached failure for the rest of a thread, even after the executor
reconnected.
## What changed
- Replay capability discovery after executor recovery and retry transient failures
on later requests while continuing to cache permanent failures.
- Avoid caching skill catalogs produced from failed discovery so a later step can
load the recovered catalog.
- Mark the MCP runtime dirty when recovered manifests change the projected MCP
servers, and allow discovery to be cancelled with the turn.
## Testing
- Cover same-request recovery after a disconnect and recovery on a later request.
- Cover retry classification through connection-attempt errors and skill catalog
caching after discovery recovers.
GitOrigin-RevId: a57f90844351e73ea831931f72a9ddc4e4f3335c
## What changed
Clarify that commits created through a GitHub app or plugin must include the
Codex co-author trailer in the tool's `message` argument. This covers commits
that create, update, or delete files.
GitOrigin-RevId: 58be9302da9f8d4f11aa100c32f779fac9cc05e9
## Why
When an MCP server rejects existing OAuth credentials, reporting that the server
is merely not logged in obscures that the user needs to authenticate again.
## What changed
Pass the MCP startup failure reason into error formatting and report that the
server requires OAuth reauthentication when appropriate. Preserve the existing
recovery hint for either `codex mcp login` or the client's OAuth sign-in flow.
## Testing
Cover the reauthentication message for both login flows and verify it in the
streamable HTTP OAuth round-trip test.
GitOrigin-RevId: 6f6d5fe7519b1a476f8b70d976223b2ea1ec938e
## Why
App tool file arguments could read and upload files without applying the active
filesystem sandbox policy.
## What changed
- Apply the effective filesystem policy, including session and turn grants, when
reading metadata and streaming files for upload.
- Reject uploads before contacting the files endpoint when the selected path is
denied.
- Report an error when the executor cannot provide sandboxed file streaming for
a restricted policy.
## Testing
Added integration coverage showing that restricted policies allow permitted
files and reject denied files before upload.
GitOrigin-RevId: 63b239c5066dcb9d18b5050089c659fb2a784909
