feat: Add performance degradation detection to context pressure monitoring
Implements 5-metric weighted degradation score to detect performance issues:
- Error patterns (30%): Consecutive errors, clustering, severity
- Framework fade (25%): Component staleness detection
- Context quality (20%): Post-compaction degradation, session age
- Behavioral indicators (15%): Tool retry patterns
- Task completion (10%): Recent error rate
Degradation levels: LOW (<20%), MODERATE (20-40%), HIGH (40-60%), CRITICAL (60%+)
Displayed in 'ffs' command output with breakdown and recommendations.
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Co-Authored-By: Claude <noreply@anthropic.com>
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