fix(swift-ios): let worktree setup finish before retrying

[t3dotgg]

The server now waits for a worktree setup script before starting the first turn. SwiftUI still stopped every request after 30 seconds. Its recovery could then send a bare turn into an empty thread while setup or cleanup was still running.

Worktree bootstrap requests now wait for their reply without the normal response deadline. Connection waits, socket sends, keepalive, disconnect handling, cancellation, and ordinary RPC deadlines stay in place. Recovery accepts a committed original message but never sends a bare turn for a worktree bootstrap. The server owns worktree cleanup, and uncertain attempts keep their stable identity.

No setup UI, wire changes, or server changes. This fixes SwiftUI compatibility with #11372.

Validation: All 32 focused native tests passed on this head. The deadline test advances a controlled clock. Other cases cover cancellation, disconnects, bounded socket sends, empty worktree recovery, committed-message recovery, and stable retry IDs. Swift parse and git diff checks pass. No device performance or layout claim.

Created with Codex.

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	13.6 KiB	—	15.1 KiB	✅
Codex	Thread snapshot wire	—	7.0 KiB	—	7.3 KiB	✅
Codex	Live turn WebSocket wire	—	6.6 KiB	—	7.8 KiB	✅
Codex	Live turn WebSocket decoded	—	57.1 KiB	—	66.4 KiB	✅
Codex	Live turn messages	—	10	—	21	✅
Claude	Total thread wire	—	13.6 KiB	—	15.1 KiB	✅
Claude	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Claude	Live turn WebSocket wire	—	6.6 KiB	—	7.8 KiB	✅
Claude	Live turn WebSocket decoded	—	57.9 KiB	—	66.4 KiB	✅
Claude	Live turn messages	—	10	—	21	✅

Baseline: unavailable · PR result: 2eb0335 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 113.9 KiB
• Claude decoded thread snapshot: 114.6 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Approved at 2eb0335

Macroscope's review found this PR approvable — This is a focused Swift iOS reliability fix for existing worktree bootstrapping, with standard RPC behavior preserved and cancellation/disconnect handling tested. The production changes are localized and do not alter product defaults, schemas, or deployment behavior.

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