fix(server): let the start-from-origin fetch outlive the 30s git timeout

[Mnigos]

Starting a new thread with New worktree and Start from origin runs git fetch --quiet origin under the driver's default 30 s deadline. On a large or stale remote the fetch is killed mid-pack, the ref never advances, and every retry downloads the same pack again and dies at 30 s, leaving tmp_pack_* leftovers behind.

fetchRemote now runs without that deadline (timeoutMs: null), the same way every push variant already does. This is the first step from the triage on #10916; narrowing the bootstrap fetch to the selected branch is left for a follow-up.

Verification

• New test in GitVcsDriverCore.test.ts delays the spawned fetch by 31 s on the test clock and asserts the remote tracking ref advances. It fails on main with Git command timed out. and passes here.
• vp test run apps/server/src/vcs/GitVcsDriverCore.test.ts: 62 tests pass. Server typecheck and lint on the touched files are clean.

Rebased on main after #11633 (#11633) landed the scoped fetch from step 2 of the triage. The timeoutMs: null now applies to both the scoped fetch and the full-fetch fallback. #11633's does not retry a scoped fetch after timeout case assumed the 30s deadline, so it is replaced by keeps a slow scoped fetch running past the default git deadline, which pins that a slow fetch is neither killed nor retried.

Fixes #10916. Implemented with Claude Code (Claude Fable 5.1).

Summary by CodeRabbit

• Bug Fixes
  • Large remote fetches can now run beyond the previous 30-second limit, preventing interruption before completion.
  • Remote tracking references are updated correctly after longer-running fetch operations.
  • Fetches that remain in progress no longer trigger an automatic retry while awaiting completion.

[macroscopeapp]

Approvability

Verdict: Approved at 02dab4e

Macroscope's review found this PR approvable — This PR makes a localized timeout correction for the start-from-origin Git fetch and adds an integration test covering fetches longer than 30 seconds. Other Git operations and product defaults remain unchanged.

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[coderabbitai]

📝 Walkthrough

Walkthrough

fetchRemote now allows Git fetches to run beyond 30 seconds. Tests verify that slow fetches do not retry, remain active past the former deadline, and update the remote tracking ref after completion.

Changes

Remote fetch timeout

Layer / File(s)	Summary
Disable fetch timeout and validate delayed completion apps/server/src/vcs/GitVcsDriverCore.ts, apps/server/src/vcs/GitVcsDriverCore.test.ts	fetchRemote passes timeoutMs: null to executeGit. Tests cover non-retrying failures, a fetch that remains pending beyond 62 seconds, and a 31-second fetch that updates refs/remotes/origin/<branch>.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: juliusmarminge, t3dotgg

Merge Risk: 🟡 Moderate · up to 4bab0

Overlapping worktree requests can launch unbounded long-running fetches and degrade server availability. Preserve the concurrency limit before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: allowing the start-from-origin fetch to exceed the default 30-second Git timeout.
Description check	✅ Passed	The description clearly explains what changed, why it changed, the verification performed, and the deferred follow-up. The UI section is not needed because this PR has no UI changes. The checklist sec…
Linked Issues check	✅ Passed	The PR meets the coding objective in issue #10916. fetchRemote now passes timeoutMs: null to the git fetch --quiet <remote> execution, so the default 30-second deadline does not terminate a long…
Out of Scope Changes check	✅ Passed	The changes stay within issue #10916. They modify the fetchRemote timeout behavior and add focused tests for timeout prevention, completion, ref advancement, and retry behavior. The deferred fetch-s…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

✨ Finishing Touches

🧪 Generate unit tests (beta)

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@apps/server/src/vcs/GitVcsDriverCore.ts`:
- Line 3272: Update the Git fetch execution path around execute and
GitWorkflowService.fetchRemote so timeoutMs: null disables only the deadline,
not gitProcesses semaphore participation. Ensure fetchRemote still runs within
gitProcesses.withPermits(1), preserving the concurrency limit for direct
worktree bootstrap calls.

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📒 Files selected for processing (2)

• apps/server/src/vcs/GitVcsDriverCore.test.ts
• apps/server/src/vcs/GitVcsDriverCore.ts

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