fix(mac): stabilize Tailscale status timeout

[steipete]

Summary

• Keep Tailscale CLI status timeouts independent from Swift cooperative-executor availability.
• Preserve TERM followed by the existing SIGKILL fallback for unresponsive commands.
• Replace the CPU-burning timeout fixture with a sleeping process that still ignores TERM.

Closes #706

Root cause

fetchStatus blocked a detached task while waiting for process output, then scheduled timeout enforcement on another Swift concurrency task. Under the heavily parallel Release test suite, executor saturation could delay that timeout task beyond the test's bound. The fixture's busy loop increased the same contention.

Proof

• Exact nightly Test Release Configuration command passed on commit 1b9caddcf0a650630b581c97f470359914299f77 with code coverage enabled.
• TailscaleCLITests.statusCommandTimesOut completed in 0.242 seconds within the full parallel Release suite.
• The focused timeout test passed 10 consecutive Release runs.
• SwiftFormat and strict SwiftLint passed on both touched Swift files.
• Structured autoreview: no accepted or actionable findings; patch correct, confidence 0.87.
• Public Model Identifier Gate: PASS; no model-bearing identifiers introduced in the candidate, test output, generated result metadata, or this public proof.

Risk

Low. The change preserves the existing timeout, TERM, and SIGKILL behavior while moving only timeout scheduling off the cooperative executor.

[claude]

Claude encountered an error —— View job

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I'll analyze this and get back to you.

[github-actions]

🔍 Code Quality Report

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Node.js Biome Formatting ✅ Status: Passed

Node.js Biome Linting ✅ Status: Passed

Node.js TypeScript Type Checking ✅ Status: Passed

Node.js Build ✅ Status: Passed

Node.js Tests ✅ Status: Passed

Node.js Security Audit ✅ Status: Passed

Node.js Test Coverage ✅ Status: Passed

Client Coverage:
• Lines: 45.4%
• Functions: 40.44%
• Branches: 35.6%
• Statements: 45.52%

Server Coverage:
• Lines: 33.38%
• Functions: 40.11%
• Branches: 27.72%
• Statements: 32.96%

Mac Formatting (SwiftFormat) ✅ Status: Passed

Mac Linting (SwiftLint) ✅ Status: Passed

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