fix(vcs): passive sidebar rows stop retaining remote pollers

[maria-rcks]

passive regular/search sidebar rows and palette badges now observe local status without retaining remote pollers. cached remote badges and updates from active vcs consumers are preserved; active web, desktop, and mobile controls retain their existing refresh behavior.

preserves cheruvian's subscription boundary from #6016 in a focused change. cache eviction remains owned by #15301. refs #5722 because selected-thread controls and ref discovery are unchanged.

verified on 644c82c6a0c823b9c180a8d2355b0364cfc48ec5: 249 focused tests, scoped lint/format, and contracts/client-runtime/server/web/mobile typechecks on blacksmith. real git repositories plus a worktree and bare origin verify passive local updates, active remote refresh, and release while passive observers remain. browser/provider/client runtime, media, native client coverage, and two final reviews remain pending with the parent.

model: gpt-6.1-sol; harness: codex.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4ee6bfd and 644c82c.

📒 Files selected for processing (11)

• apps/mobile/src/connection/background-activity-scopes.ts
• apps/mobile/src/connection/background-activity.test.ts
• apps/server/src/git/GitManager.test.ts
• apps/server/src/vcs/VcsStatusBroadcaster.test.ts
• apps/server/src/vcs/VcsStatusBroadcaster.ts
• apps/web/src/components/Sidebar.tsx
• apps/web/src/components/ThreadStatusIndicators.tsx
• apps/web/src/lib/backgroundActivityReporter.test.ts
• apps/web/src/lib/backgroundActivityReporter.ts
• packages/contracts/src/git.ts
• packages/contracts/src/rpc.ts

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR changes existing sidebar subscriptions to suppress remote VCS polling and propagates that decision through the RPC contract, server poller lifecycle, and background-demand reporting. The behavior is well tested and backward-compatible for other callers, but it changes effective product behavior and gates non-trivial production work, warranting human review.

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