v0.8.5 — Better Diagnostics and CI

• Specific error messages: Pool degradation notifications now explain why autocomplete is unavailable — warmup failure, circuit breaker, or authentication — instead of always suggesting "run claude in your terminal." (#2)
• Warmup timeout: CLI subprocesses that produce no output within 30 seconds are now detected and reported, instead of hanging silently.
• Open Log button: The error notification now offers "Open Log" instead of "Open Terminal," making it easier to diagnose issues.
• Restart flow fix: "Restart Pools" from the error notification now properly resets the status bar state.
• CI pipeline: Added GitHub Actions workflow (lint, type-check, format, unit tests) with branch protection on main.