Coalesce status refreshes by remote

[juliusmarminge]

Summary

• Change status upstream refresh caching to key off gitCommonDir and remote name instead of the full upstream ref details.
• Simplify the status refresh fetch to use git fetch --quiet --no-tags <remote> for sibling worktrees on the same remote.
• Update integration coverage for shared refreshes and failed-refresh backoff across worktrees, and adjust the fetch expectation accordingly.

Testing

• bun fmt
• bun lint
• bun typecheck
• bun run test

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Note

Medium Risk
Changes the statusDetails upstream refresh cache key and fetch strategy, which can alter when/what refs get updated and may affect status accuracy or fetch load across worktrees/remotes.

Overview
Coalesces statusDetails refresh work across worktrees by remote. The upstream-refresh cache key is simplified from (gitCommonDir, upstreamRef/branch) to (gitCommonDir, remoteName), so sibling worktrees tracking different branches on the same remote share a single refresh and failure backoff window.

Simplifies refresh fetching. Status refresh now runs git fetch --quiet --no-tags <remote> (instead of fetching a specific upstream refspec), and tests are updated to assert the new fetch args and to cover coalescing/backoff when worktrees have different upstream refs on the same remote.

^{Reviewed by Cursor Bugbot for commit 17dfc2e. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Coalesce git status remote refreshes by remote name instead of per-branch

• Changes the status refresh cache key from (gitCommonDir, upstreamRef, upstreamBranch) to (gitCommonDir, remoteName) in GitCore.ts, so all branches sharing the same remote and common dir share a single fetch entry.
• Replaces the branch-specific refspec fetch with a broad git fetch --quiet --no-tags <remote> call, fetching all refs from the remote at once.
• Behavioral Change: worktrees on the same remote now trigger at most one fetch per TTL window instead of one per tracked branch; this reduces fetch frequency but means a branch-specific fetch is no longer issued.

^{Macroscope summarized 17dfc2e.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR refactors the git status refresh caching to coalesce fetches by remote instead of by specific upstream ref, an internal optimization. Changes are focused, well-tested with updated test cases, and don't touch sensitive areas.

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