## Why
Terminal autowrap for oversized URL tokens can drop the user-message gutter and background on continuation rows.
## What changed
- Explicitly wrap long URLs within the available message width.
- Preserve the complete OSC 8 hyperlink destination on every wrapped fragment.
- Keep the user-message gutter and background styling across continuation rows.
## Testing
Add history-cell and VT100 coverage for URL content, hyperlink targets, gutters, and backgrounds across wrapped rows.
GitOrigin-RevId: 59514eee4ab967bd937b55574b9f8d0d1c82df7c
## Why
Guardian review sessions must not gain access to paths that the parent turn is
not allowed to read.
## What changed
- Derive Guardian permissions by intersecting managed parent filesystem rules
with read-only access, preserving denied paths and restricting network access.
- Offer Guardian execution tools only when a managed sandbox can enforce those
rules.
- Include the selected environment IDs in the review-session reuse key so a
session is not reused across different environment sets.
## Testing
Update the Guardian reuse integration test to verify that a review cannot read
a parent-denied file or write a local file while consecutive reviews still
reuse the same session.
GitOrigin-RevId: 20f17a6c379f1eda651e8508459d642a51e4ce94
## What changed
- Add a `LunaSampler` that opens an authenticated Responses WebSocket and reuses it for structured, tool-free `gpt-5.6-luna` requests.
- Carry the host's provider, authentication, proxy, attribution, and service-tier configuration into the connection and requests.
- Require strict JSON schemas, preserve per-request reasoning effort and turn metadata, and reject missing or oversized output.
## Testing
- Add a WebSocket test covering authentication and attribution headers, connection reuse, structured request fields, per-turn metadata, reasoning effort, and returned output.
GitOrigin-RevId: aef85fd8ddcfcb7c76a9ede0d3191e3a0321656b
## What changed
- Add a `SecurityRiskScore` rollout item containing a category and numeric score.
- Persist the item in both thread history modes while excluding it from model context, user-visible thread history, search text, forks, and reconstructed conversation history.
- Re-export the score type from the extension API.
## Testing
- Cover serialization, persistence and loading, thread history projection, session reconstruction, append planning, and memory filtering.
GitOrigin-RevId: 1926fe366aeaa75052708a6da589f45a38eefb52
## What changed
- Send the scripted HTTP response before queuing body deltas in the
single-stream byte-budget test.
- Allow 30 seconds for barrier requests in both byte-budget tests while
retaining the default timeout for other operations.
GitOrigin-RevId: ac65580b479d93fcbcca787f15e04c084f0aa56b
## What changed
- Add dedicated coverage for explicitly starting a queued item that a prompt hook rejects.
- Verify the rejected item is consumed and no model request is sent.
- Keep the automatic queue dispatch test focused on consuming a rejected item while allowing later queued input to proceed.
GitOrigin-RevId: e01cefb9d8581b0d4be05d4595f279d61e628e83
## What changed
- Collect borrowed call IDs in a single pass instead of cloning IDs across
separate sets.
- Record orphan positions and compact the history only when orphan outputs are
present, while preserving the existing matching and error behavior.
GitOrigin-RevId: de399ba92ff451cb12fc69218d60d3ac29fccb3d
## Why
Streaming reads previously rejected requests that used a platform filesystem
sandbox.
## What changed
- Open streamed files in the sandbox helper and return the open file to the
exec-server by passing a file descriptor on Unix or duplicating a file handle
on Windows.
- Advertise support through the `sandboxedFileStreaming` environment capability.
- Preserve close-on-exec behavior for transferred descriptors, including the
required inherited-descriptor cleanup on macOS.
## Testing
- Cover bounded sandboxed streams, continued reads after path replacement, and
rejection of symlink escapes outside readable roots.
GitOrigin-RevId: 677b2444b74e834b78b87a8554bc119c1c6e08b2
## What changed
- Add the `codex-guardian-v2` crate with an extension install entry point that does not register contributors yet.
- Register the crate in the Cargo workspace and add its Bazel target.
GitOrigin-RevId: 7c0c9479c6722d65f0f0dad9b0fd4a756e4649b3
## What changed
- Use a never-resolving promise when verifying that a session continues to
enforce its yield limit after terminating a cell.
- Use `yield_control()` to create the yielded cell in the notification-draining
test instead of relying on timer scheduling.
GitOrigin-RevId: 01cdaa94e5b8b5c89c6fa98c4bbdb28a690678e0
## Why
Inline visualization viewer documents must remain outside locations that a
sandboxed session can modify before they are opened in a browser.
## What changed
- Materialize viewer documents in a dedicated cache under `CODEX_HOME`, keyed
by the source and artifact thread IDs, instead of alongside visualization
artifacts.
- Create visualization links only when the active filesystem policy cannot
write to the viewer cache. This also disables links for full-disk-write
sessions and applies the policy consistently when loading transcript history.
- Reject viewer cache paths containing symbolic links and track materialized
documents in memory so unchanged viewers are reused without trusting existing
file contents.
## Testing
- Verify that rendering an unchanged visualization reuses the existing viewer
file, while an updated fragment refreshes it.
GitOrigin-RevId: 12b7fbe522a68076e5d683a987b7801940d131c2
## What changed
- Add `RecoverTurnRequest` and `CodexThread::recover_turn_if_idle` to resume an interrupted regular turn with its existing turn ID and updated thread settings.
- Treat recovery separately from automatic idle work so it can resume in Plan mode without injecting an empty user message.
- Reject recovery while another turn is active without applying settings or queuing input.
## Testing
- Cover successful Plan-mode recovery, turn ID preservation, and the absence of an empty user message.
- Cover active-turn rejection and verify that it leaves settings and pending input unchanged.
GitOrigin-RevId: 2376fdc78b5d48b571633981960741ba269ab1ef
## What changed
- Represent blocked network requests as approval actions so permission hooks,
automatic review, and user review use the common approval flow.
- Route network requests using the active turn's review settings, including for
background terminals started by an earlier turn.
- Record the final applied network decision in tool telemetry without exposing
the destination or assigning an approval source.
- Persist deny amendments and keep the blocked request denied.
## Testing
Added coverage for strict automatic review, cross-turn background network
requests, deny amendment persistence, and destination-safe telemetry.
GitOrigin-RevId: a2a9d106962f407ed93f4d198f40ced15f090b8e
## What changed
- Add `ThreadStore::revert_thread` to retain history before a selected turn by creating a new immutable rollout and atomically switching the thread's stored rollout path.
- Preserve the logical thread ID and session metadata across repeated reverts.
- Track every rollout owned by a thread so archive, unarchive, and delete operations handle the complete lineage and restore moved files when metadata updates fail.
- Prevent deletion when forks still reference any rollout in the thread's lineage.
## Testing
- Cover repeated reverts, compressed source rollouts, lifecycle operations over reverted histories, reference-aware deletion, and cross-process unarchive locking.
GitOrigin-RevId: 1c05a6db3d0036ee91b562263d7ca200c6a0ea71
## What changed
- Delete the unused standalone `apply_patch` instruction template and its
`codex-prompts` export.
- Simplify prompt-caching coverage to assert that requests use the model's base
instructions.
GitOrigin-RevId: 8c0dc9426d9ac0184d587272622db608a75e8436
## What changed
- Accept root `http://` and `https://` URLs in `--code-mode-host` and use the
shared gRPC session provider for those endpoints.
- Keep `ws://` and `wss://` URLs on the existing WebSocket transport.
- Reject paths, queries, fragments, and credentials where unsupported, without
exposing gRPC URL credentials in command-line validation errors.
## Testing
- Cover argument parsing and transport selection for both remote protocols.
- Exercise a gRPC host shared across app-server threads and verify credential
rejection does not disclose usernames or passwords.
GitOrigin-RevId: b6516a85cf76db5c4cea620f89ef866d8af30cf0
## What changed
Declare `codex-execpolicy` as a dev dependency of `codex-protocol`, matching
its use exclusively by tests.
GitOrigin-RevId: a19c18fc89a04560d80b16e2e530abb633d1ee35
## What changed
- Resolve manifest-declared metric operations against the executor filesystem for remote plugin commands.
- Create the measurement sidecar in an executor-native, owner-private temporary directory, stream its bounded output back for validation, and clean up the directory afterward.
- Extend the exec-server protocol with the executor temporary directory and atomic private-directory creation.
## Testing
- Cover remote unified-exec measurements for foreground and background commands.
- Verify private directories use owner-only permissions on Unix and fail closed on unsupported platforms.
GitOrigin-RevId: dbbd0a84717b91237fc5728e510e18994eb46dd4
## What changed
- Add `thread-credits` and `estimated-thread-cost` items to the configurable
status line and terminal title for Enterprise workspaces.
- Fetch one shared thread usage estimate only when either item is selected,
omit unavailable values, and refresh the display after turns complete.
- Preserve the last nonzero estimate while usage settles, with bounded delayed
refreshes and retries for transient failures.
## Testing
- Add coverage for configuration, rendering, previews, plan availability,
replay handling, retries, and post-turn settlement.
GitOrigin-RevId: dd69ee621c5bca0e5d9edd32b2bba42487eb1500
## What changed
- Extend `account/usage/read` with an optional `threadId` request and a
backward-compatible `threadUsage` response containing estimated credits,
optional USD cost, and model, reasoning, speed, and token breakdowns.
- Fetch thread usage for eligible Business and Enterprise plans when `/status`
is opened, then update the rendered status card asynchronously.
- Preserve terminal scrollback when replacing a visible status-card tail, and
append a refreshed card when the original tail can no longer be updated.
## Testing
- Add app-server coverage for authentication, canonical thread IDs,
unavailable billing routes, and malformed IDs.
- Add TUI coverage for usage formatting, stale responses, retries, history
updates, terminal reflow, and scrollback preservation.
GitOrigin-RevId: 49300914b3fba917c0f08e8595363e04e5ba6d37
## What changed
- Load `proto_library` for the code-mode protocol directly from the
`com_google_protobuf` repository.
- Remove the now-unneeded direct `rules_proto` module dependency.
GitOrigin-RevId: 5a01191b2c46c7fafd263ed93f153a878b09aaa8
## What changed
- Add end-to-end tests for curated plugin measurements through classic shell execution and unified exec.
- Cover unified background commands whose measurements arrive after the turn completes.
- Verify command attribution and measurement payloads, including values, dimensions, execution IDs, and thread, turn, and item IDs.
GitOrigin-RevId: 866103aafef8d3454123c40aee7041912ad0b7fc
## Why
Unified exec can yield while a command is still running. Plugin measurement
collection must remain active until that background command exits, including
when its item completion arrives after the turn has completed.
## What changed
- Keep the plugin metrics sidecar with the stored process and let either the
exit watcher or a poll that observes completion finalize it exactly once.
- Retain completed turn analytics state while tool items are pending so late
command completion events can be emitted without duplicating the turn event.
## Testing
- Verify that a background command completed after its turn emits a command
execution event and does not emit a second turn event.
GitOrigin-RevId: ecf715b3e047aa29ca9a417d12d955257fed8557
## What changed
- Add `TurnInputRequest` and typed submission results for atomically starting a turn, steering the active turn, or declining input with a specific reason.
- Expose `start_or_steer_turn`, `start_turn_if_idle`, and `steer_turn` on `CodexThread`, and migrate Core consumers to these APIs.
- Make app-server `turn/start` steer an active regular turn and return that turn's ID. Reject incompatible output schemas and non-steerable turns without applying settings or enqueueing input.
## Testing
- Cover concurrent start-or-steer submissions, accepted and rejected settings updates, output-schema compatibility, idle-start rejection, and app-server steering.
GitOrigin-RevId: dd9b5528d76ec650c019e97af420bc13190ea86a
## Why
World-state snapshots and merge patches are keyed collections of sections. Allowing
their persisted `state` field to contain any JSON value required replay code to
handle shapes that cannot represent world state.
## What changed
- Type `WorldStateItem.state` and snapshot patches as JSON object maps.
- Reconstruct full snapshots directly from those maps and apply patches without
fallible arbitrary-value conversions.
- Regenerate the app-server protocol schema for the object-only representation.
GitOrigin-RevId: 3d7662b74f3dd1f3ccc5fdd0200074c13a73cbe5
## What changed
- Add fractional Unix creation times to locally authored user, developer, agent, and tool-output items when they enter durable conversation history.
- Preserve any creation time already supplied with an item across subsequent requests, remote compaction, and resumed history.
## Testing
- Cover timestamp assignment and preservation in session, client, tool, agent-spawn, and remote-compaction tests.
GitOrigin-RevId: 431d1770b9746005c808bc0a43953845166d68ad
## What changed
- Add `Client::get_thread_usage` for querying authoritative estimated credit
and dollar usage for a thread across both supported backend path styles.
- Expose usage totals and optional model, reasoning effort, speed, and token
breakdowns through `ThreadUsage` and `ThreadUsageBreakdownGroup`.
- Reject responses that do not include the requested thread.
## Testing
- Cover endpoint paths, request serialization, complete and partial usage
responses, and mismatched thread IDs.
GitOrigin-RevId: 16c83590b2c804e0182b4493cf2aa39206029c77
## Why
Executor-backed skills can include bundled scripts, so skill readers need the
skill directory in the executor filesystem to locate them.
## What changed
- Add `skill_root` to `skills.read` responses for executor-backed skills.
- Derive the root from the parent directory of the skill's main resource and
omit the field for other skill authorities.
## Testing
- Verify executor skill reads return the expected root for both `SKILL.md` and
a referenced resource.
GitOrigin-RevId: b7035c7e2e62155890795fb508fefe3a1c17805b
## What changed
- Try the explicitly configured Windows HTTP or SOCKS5 proxy port first, then scan the protocol's preferred port range when that port is unavailable.
- Reserve HTTP and SOCKS5 listeners independently so a SOCKS5 collision does not replace an already available HTTP listener.
- Retain ephemeral loopback fallback when all preferred ports are unavailable, and document the HTTP (`3128-3159`) and SOCKS5 (`8081-8112`) ranges.
## Testing
- Cover bounded HTTP and SOCKS5 fallback, independent listener reservation, and ephemeral fallback after preferred-port exhaustion.
GitOrigin-RevId: 002c641f5bd70fedf04cca96c65c5fee2c5ebcac
## Why
Skill catalogs can present shortened package locators, but callers previously had
to expand those aliases before reading a skill.
## What changed
- Resolve catalog aliases automatically when `skills.read` looks up a
model-visible executor or orchestrator skill package.
- Update skill prompts and tool documentation to tell models to pass the listed
package locator directly.
## Testing
- Exercise reading an executor skill through its shortened package locator when
the skills catalog exceeds its context budget.
GitOrigin-RevId: d1cdfd64002510b616146929deb5b7077850b951
## What changed
- Use each `ExternalAuth` provider's error classification for resolve, refresh,
and validation failures.
- Allow runtime providers to be replaced, clearing any recorded permanent
refresh failure after the replacement resolves successfully.
- Preserve workload identity as immutable, host-managed authentication while
sharing external ChatGPT credentials through the process-local store.
## Testing
- Cover provider replacement after a permanent failure, provider-defined error
classification, workload identity immutability, and refreshed headers after
an unauthorized response.
GitOrigin-RevId: ec75cf9224dc82d3fd10063606c724e3b06fb1e7
## What changed
- Reopen a cached code-mode session when its gRPC host stops, while
serializing concurrent reconnection attempts and coordinating shutdown.
- Scope cell IDs to the new host generation so callbacks remain consistent
and stale `wait` or `terminate` requests are rejected.
- Accept both `unix://` and `unix:` endpoints for gRPC hosts on Unix systems.
## Testing
- Cover host restart recovery, concurrent execution after reconnection,
generation-aware callbacks and cell operations, stale cell rejection, and
Unix socket execution.
GitOrigin-RevId: 548e168fdcef7f7d54bd32262e614886bf7bdd32
## Why
A single execution can trigger multiple network approval reviews. Its tool
result should reflect the latest specific rejection.
## What changed
- Let each explicit network review outcome replace the previously recorded
outcome for the execution.
- Keep generic blocked-request messages as fallbacks that cannot overwrite an
explicit review outcome.
## Testing
- Add unit coverage for outcome precedence.
- Add an integration test that rejects two network requests from one execution
and verifies that only the latest rejection is returned.
GitOrigin-RevId: 644a01e5c49855adcdc48ba8f91baededce26875
## What changed
- Create a metrics sidecar for attributed local plugin commands launched through unified exec, and grant the sandbox access to its output file.
- Publish valid measurements when the initial command exits, while discarding the sidecar when the process remains live for later polling.
- Strip inherited or configured `CODEX_PLUGIN_METRICS_OUTPUT` values so each command can only use its own sidecar.
GitOrigin-RevId: 43e669e4c77171aec8a798de0c12ca13bfb8adee
## What changed
- Provide matching local plugin commands with a sandbox-writable temporary output file through `CODEX_PLUGIN_METRICS_OUTPUT` when analytics is enabled.
- Validate successful command output against the plugin's `analytics.yaml` declaration, including measurement names, enum dimensions, finite values, duplicate rows, and size limits, before publishing analytics events.
- Keep the output path reserved from user overrides and clean up the temporary file after execution.
## Testing
- Cover output validation, limits, cleanup, sandbox permissions, environment handling, and path replacement.
- Verify measurement collection through both classic and zsh-fork shell runtimes.
GitOrigin-RevId: 88af0f87dc2f207fcbcca6af498f5c940d79349d
## What changed
- Extract `x-models-etag` from `codex.response.metadata` events and emit it as a `ModelsEtag` response event.
- Stop reading or reporting the model ETag from WebSocket upgrade headers.
## Testing
- Update the WebSocket response-stream test to deliver the ETag through a metadata event and verify that it is emitted.
GitOrigin-RevId: 9b9cff3d8a0a914549aca62d8d316483a9a47f69
## What changed
- Add `http_headers_helper` configuration for local streamable HTTP MCP servers. The configured shell command runs once per connection and returns a JSON object of headers that is cached across requests.
- Apply helper headers to MCP startup and OAuth flows while restricting them to the server origin, stopping redirects, rejecting reserved or duplicate headers, and enforcing output and execution limits.
- Reject helpers for remote or managed-disabled servers, use the local environment working directory, and redact helper commands from `codex mcp list` and `codex mcp get` output.
## Testing
- Cover configuration validation, helper lifecycle and output parsing, origin isolation, OAuth discovery and token refresh, managed requirements, environment selection, and CLI redaction.
GitOrigin-RevId: 84e0e26ce75520b0869d37c72b1678e033bd6818
## Why
`thread/revert` keeps the logical thread ID while selecting a new immutable
rollout. Using the thread ID for persisted history can therefore read or update
the wrong rollout.
## What changed
- Centralize resolution of a thread's current rollout across live writers,
SQLite metadata, and filesystem fallbacks.
- Key history materialization, lineage traversal, paging, turn lookup, and fork
boundaries by immutable rollout ID while retaining the thread ID for the
logical thread.
- Treat SQLite's selected rollout as authoritative for paginated threads so a
filesystem scan cannot select an older rollout after `thread/revert`.
## Testing
Add a regression test showing that update-ordinal item paging reads from the
selected rollout ID when it differs from the thread ID.
GitOrigin-RevId: 1101e548a6e6c6d319996e24cb650e5b03ab7fbb
## What changed
- Mark developer messages received from clients with `client_authored` harness
metadata when `retain_client_developer_messages` is enabled.
- Carry that provenance through pending input and persist it alongside rollout
response items without adding it to provider requests or the serialized
`TurnInput` payload.
- Preserve existing behavior for unannotated response items and when the
feature is disabled.
## Testing
- Cover client item injection before and during turns, additional application
context, rollout replay, image resize notices, and serialization boundaries.
GitOrigin-RevId: f385c177732becde732272e4b8440eb91f5c1039
## What changed
- Reuse desired and rendered heights for active transcript cells that report a stable height.
- Invalidate the cached layout when the cell identity, revision, width, render mode, or syntax theme changes, and when the active cell is removed.
- Continue rebuilding display lines on every frame so animated content stays live, while dynamic-height cells bypass the persistent cache.
## Testing
- Add rendering tests for height reuse, bottom-anchored overflow, cache invalidation, animated display lines, and dynamic-height cells.
GitOrigin-RevId: 414cc4269bfb6b68105837c82e31787272d335a7
## What changed
- Parse `node_repl_auto_review_required` and `node_repl_disabled` from model catalog entries and include their values in each turn's Responses API metadata.
- Treat both fields as reserved metadata so client-provided values cannot override the selected model's policy.
- Use the selected review model's catalog entry when building metadata for review turns.
## Testing
- Cover metadata propagation across model switches, review turns, Responses API requests, and MCP tool calls.
GitOrigin-RevId: c1f63426eeb8e559abff439fbc618716a4908aff
## What changed
- Add `PluginMeasurementsInput` and `PluginMeasurementRow`, plus an analytics
client method for recording batches and checking whether analytics are enabled.
- Emit each valid row as a `codex_plugin_measurement_event` with thread, turn,
item, plugin, execution, and operation context.
- Bound batches at 100 rows and reject non-finite values, invalid identifiers,
and rows with more than eight dimensions.
- Treat measurement events as plugin events when routing API-key analytics.
## Testing
- Cover batch limits, row filtering, serialized event payloads, and API-key
plugin-event routing.
GitOrigin-RevId: f949ed06246ee1e22466df2660076f2d4f556444
## What changed
- Load version 1 `analytics.yaml` manifests from trusted plugin roots and map declared operations, measurements, and enum dimensions to exact script paths.
- Expose resolution types and bind a declared operation to the plugin identity returned by fresh command attribution.
- Reject malformed, oversized, ambiguous, or unsafe manifests without disabling normal script attribution.
## Testing
- Cover exact script resolution, measurement names shared across operations, and invalid manifests including duplicate keys, path traversal, symlink escapes, invalid identifiers, and oversized files.
GitOrigin-RevId: 1e2f221b9f2c3d7faffe578c7a8499ad4ed933ca
## Why
`parent_turn_id` identifies the immediate caller of a nested request, but not the
top-level turn that initiated a multi-level chain of work.
## What changed
- Add `root_turn_id` to turn state, submissions, and Responses API metadata.
- Propagate the root through spawned agents, delegated work, review sessions, and
turn-triggering inter-agent messages.
- Omit the root when background work has no user turn or combined input makes the
root ambiguous.
## Testing
Added coverage for nested agent resumes, reviews, mailbox delivery, steered input,
and reserved metadata handling.
GitOrigin-RevId: 60057db2ee81f4efefa946a9f63c74ff98b93929
## What changed
- Recognize `Get-Content` reads of indexed `SKILL.md` files as implicit skill invocations.
- Support the optional `-Raw` flag, quoted paths containing spaces, and Windows paths without stripping backslashes.
## Testing
- Add unit coverage for the supported `Get-Content` forms and Windows path parsing.
GitOrigin-RevId: 681f2e2fff9a597326bc94b97a31e311ef21b949
## What changed
- Register `retain_client_developer_messages` as an under-development feature
that is disabled by default.
- Expose the feature in the configuration schema.
GitOrigin-RevId: dc56c48fe79a9f288b7fe0a11d97af992d36797f
## Why
Subagents can reuse cached MCP tool definitions without opening another server
connection immediately, but marking a server as required previously forced eager
startup even when its cached tools were available.
## What changed
- Allow required MCP servers with usable cached tools to remain dormant under
the lazy startup policy.
- Treat those cached tools as satisfying required-server validation and tool
catalog capture until the server is needed.
- Preserve eager startup for required servers without cached tools and start a
dormant server when one of its tools is called.
## Testing
Extend the cached HTTP MCP subagent test to cover both optional and required
servers, verifying that the required server stays dormant until its cached tool
is called.
GitOrigin-RevId: 48ea20b9ae447eef27461caee2320ea78465bb6a
## Why
Sanitizing user messages and pasted text always allocated a new string, even
when the input contained no terminal control characters.
## What changed
- Return a `Cow<str>` from `sanitize_user_text` so clean borrowed input remains
borrowed.
- Reuse owned input buffers when sanitization leaves the text intact or only
removes content at the edges.
- Update transcript rendering, history cells, and paste handling to consume the
borrowed-or-owned result without unnecessary cloning.
## Testing
Add sanitizer coverage for clean text, control sequences, Unicode control
characters, incomplete escape sequences, buffer reuse, and multi-fragment
output.
GitOrigin-RevId: 9e39cbc0d83c5791941b37a7eb4bb918c1a05f68
## What changed
- Require delegated Codex sessions to use the `never` approval policy and reject
delegate creation with any prompt-capable policy.
- Stop forwarding delegate approval and permission requests to the parent
session. Approval-requiring commands and MCP tool calls are denied within the
delegate instead.
- Skip prompts for missing skill MCP dependencies when approvals are disabled.
## Testing
Add coverage for review and Guardian delegates to verify that command
escalations, MCP approvals, and skill dependency installation do not prompt or
execute approval-gated actions.
GitOrigin-RevId: fee96a97624352cd25c904592ba7eebe2ae3fd63
## What changed
- Add the `lru_plus_lexical_v1` selector, combining the 50 most recent skills
with weighted lexical matches through reciprocal rank fusion.
- Include the combined selector in the shadow-selection experiment and propagate
query and candidate truncation metadata from both inputs.
- Generalize the existing reciprocal-rank fusion helper to accept a rank
constant while preserving the existing lexical/character selector behavior.
## Testing
- Cover lexical-only selection, merging recent and matching skills, promotion
from agreement between both rankings, and weak overlaps.
- Extend the skills extension test to verify invocation metrics for the new
selector alongside `lru_v1`.
GitOrigin-RevId: 1b7b82bc97ea919c719cd05a009351b701019306
