Phase 9 implementation verification - all guided troubleshooting features are in place:
- Proactive quality prompts with 5-minute threshold (proactive.js)
- Repeated-setting change detection with guided calibration flow
- Post-feedback explanations via DiagnosticEngine.GetDiagnosticFor
- Feature discovery notifications with quiet hours support (notifier.go)
- Contextual help system with 73 articles (help.js + help_articles.json)
All acceptance criteria met. Tests passing.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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