Complete issue #39 boot diagnostics, telemetry, and boot command

[thymikee]

Summary

Complete the remaining scope for issue #39 and apply follow-up code review fixes.

Implemented

• Added phase-aware failure reasons and actionable hints for boot/connect paths:
  • IOS_BOOT_TIMEOUT
  • IOS_RUNNER_CONNECT_TIMEOUT
  • ANDROID_BOOT_TIMEOUT
  • ADB_TRANSPORT_UNAVAILABLE
  • CI_RESOURCE_STARVATION_SUSPECTED
• Added retry telemetry support in shared retry utility (attempt, phase, delay, elapsed, remaining, reason) and wired it into iOS/Android boot flows.
• Added explicit boot command support:
  • agent-device boot --platform ios|android
  • CLI output + usage + capability matrix updates.
• Improved diagnostics consistency for iOS runner fallback failures.
• Tightened classifier behavior to avoid over-classifying connect-phase errors.
• Reduced redundant iOS boot state polling in retry loop.
• Added boot handler unit tests (missing selector, unsupported device kind, supported success).
• Ignored test/artifacts/ in .gitignore to prevent accidental commits.

Review follow-up fixes

• Enforced capability gating in boot handler before readiness checks.
• Coerced terminal Android "still booting" exhaustion to timeout reason path for clearer CI triage.
• Added/extended tests for classifier/connect behavior.

Verification

• pnpm typecheck
• pnpm test:unit
• pnpm test:smoke

All pass locally in this branch.

Closes #39

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2026-02-12 14:00 UTC