refactor: remove git detection from workspace wire and folder browse

[sailist]

Related Issue

None — the problem is explained below.

Problem

Workspace list responses and folder-browser (fs:browse) entries each carried best-effort git metadata (is_git_repo, branch) that required a .git / HEAD probe on every request, duplicated across both server generations (v1 and v2). The web UI consumed it only to render per-workspace git badges and branch labels — duplicating the branch/PR/diff status already shown for the active session, which comes from the dedicated session-level git status endpoint with proper caching. Two branch sources also disagreed in edge cases (worktrees, detached HEAD, stale values).

What changed

• Removed is_git_repo / branch from the workspace wire schema and the fs:browse entry schema (shared protocol, the kap-server vendored copy, and the klient contract), and from both servers' workspace hydration and folder-browse paths; deleted all server-side detectGit probing plus the now-unused GitInfo types and re-exports.
• Web: removed the git badges in the add-workspace dialog and folder browser, the per-workspace branch line in the mobile workspace switcher (falls back to the path), and the corresponding wire/type/mapper fields and locale strings. The chat header keeps showing branch, PR, and diff status from the active session's git status, unchanged.
• The session-level git status endpoint remains the single source of git/PR information and is behaviorally untouched.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 1b17362

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[pkg-pr-new]

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npx https://pkg.pr.new/@moonshot-ai/kimi-code@1b17362

commit: 1b17362