chore: sync vendor/zoekt with upstream sourcegraph/zoekt

[msukkari]

Summary

• Bumps the vendor/zoekt submodule to pull in 108 upstream commits from sourcegraph/zoekt (first upstream sync on the fork). See the companion PR: chore: sync with upstream sourcegraph/zoekt zoekt#10.
• Renames the zoekt-git-index flag -shard_prefix → -shard_prefix_override in packages/backend/src/zoekt.ts to match the upstream rename (Add ShardPrefixOverride to support custom shard naming sourcegraph/zoekt#1005).

Important

The zoekt reference in this PR currently points at the feature branch HEAD of sourcebot-dev/zoekt#10 (commit 8566836f). Once that PR is merged into sourcebot-dev/zoekt@main, this submodule pointer must be re-pinned to the resulting merge commit before this PR lands.

Test plan

• make zoekt builds all zoekt binaries against the upgraded source.
• yarn workspace @sourcebot/backend build and yarn workspace @sourcebot/web build compile cleanly.
• Full worker indexing job completes: 1027 files indexed into 1_3_v16.00000.zoekt with the new -shard_prefix_override flag.
• Sourcebot web /api/search returns expected results end-to-end via gRPC against the upgraded zoekt-webserver (verified with a lang:typescript query and a plain text query; 3490 matches over 396 files for sourcebot).
• Zoekt REST search path with X-TENANT-ID header still works.

Summary by CodeRabbit

• New Features

  • Added repo metadata support and a new "meta" query node to expose and filter repository metadata.
  • Updated API typings to include Meta message and metadata fields for metadata-aware search responses.

• Chores

  • Synced the vendored search-indexing library with upstream and updated indexing configuration.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e8c4a481-a297-4cd0-ba99-dae0f37e2fe3

📥 Commits

Reviewing files that changed from the base of the PR and between 03990d3 and 7905ec7.

📒 Files selected for processing (1)

• vendor/zoekt

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Walkthrough

Updated vendored zoekt to a new upstream commit, changed the backend zoekt-git-index argument from -shard_prefix to -shard_prefix_override, added a CHANGELOG entry, and introduced new protobuf typings: Meta message, Q.meta, and Repository.metadata in web gRPC types.

Changes

Cohort / File(s)	Summary
Changelog CHANGELOG.md	Added Unreleased entry noting vendored vendor/zoekt sync with upstream.
Backend command packages/backend/src/zoekt.ts	Replaced -shard_prefix ${shardPrefix} with -shard_prefix_override ${shardPrefix} in the zoekt-git-index invocation.
Vendored dependency vendor/zoekt	Bumped vendored zoekt submodule reference from dec971ae... to da9bf1a3c96b438268e2692c4b4fd7a3d341c2c9.
Web gRPC typings / proto additions packages/web/src/proto/query.ts, packages/web/src/proto/webserver.ts, packages/web/src/proto/zoekt/webserver/v1/Meta.ts, packages/web/src/proto/zoekt/webserver/v1/Q.ts, packages/web/src/proto/zoekt/webserver/v1/Repository.ts	Added Meta message typings and registration; added Meta/Meta__Output types; added optional meta field and "meta" discriminator to Q/Q__Output; added metadata map field to Repository/Repository__Output.

Sequence Diagram(s)

(omitted)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• chore: Bump zoekt #921: Also updates the vendored vendor/zoekt submodule pointer (related vendor bump).

Suggested reviewers

• brendan-kellam

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely summarizes the main change: syncing the vendored zoekt submodule with upstream sourcegraph/zoekt.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch msukkari/sync-zoekt-upstream

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@vendor/zoekt`:
- Line 1: Update the vendor/zoekt submodule reference from the feature-branch
commit 8566836f to the merge commit on sourcebot-dev/zoekt@main once PR `#10`
merges: fetch origin for the sourcebot-dev/zoekt remote, identify the new merge
commit on main, update the submodule at vendor/zoekt to point at that merge
commit (e.g., git fetch && git checkout <merge-commit> inside vendor/zoekt),
then stage and commit the change to the superproject so vendor/zoekt points to
the merged commit before merging this PR.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a9d7dc4b-608a-411e-b17c-e913eac49e22

📥 Commits

Reviewing files that changed from the base of the PR and between b8145a6 and 7529afa.

📒 Files selected for processing (3)

• CHANGELOG.md
• packages/backend/src/zoekt.ts
• vendor/zoekt