RLCR: Session scope gating and stagnation handling for large plans

[zevorn]

Summary

After a 29-round RLCR session (circuit breaker triggered), methodology analysis identified several improvement opportunities for handling large implementation plans.

Key Findings

1. Plan-Session Mismatch: Plans with 50+ tasks cannot complete in a single session. Productivity dropped from 100% (rounds 1-10) to 67% (rounds 21-29).
2. Missing Session Boundary: No graceful exit for context exhaustion. 5 stalled rounds before circuit breaker.
3. Verification Debt Spiral: Implementer outran tests; debt dominated last 15 rounds.
4. Review Repetition: Full remaining plan restated every review, consuming tokens without new info.
5. Contract Calibration Gap: Over-ambitious contracts took 10 rounds to self-correct.

Proposed Improvements

1. Plan scope gate: require milestone decomposition for plans with 15+ tasks
2. Hard session limit (8-10 rounds) with automatic checkpoint/resume
3. Test-with-implementation rule (P0 rejection if missing)
4. Review focus mode after round 5 (delta-only, not full restatement)
5. Contract calibration after rounds 1-3
6. Context exhaustion exit: 2 stalled rounds triggers session boundary
7. Post-edit verification to catch silent failures in same round