Triage and merge-wave lessons

WAVE.LESSON.changelog-policy-violation-multiplier=brief contradicting CONTRIBUTING.md L110 produced violations on 5 of 8 PRs (#3300, #3302, #3304, #3305, #3308); k326 + k320 captureWAVE.LESSON.cr-throttle-burst-correlation=8 PRs in <15min triggered k322 sustained-throttle on multiple PRs (#3306 worst case)WAVE.LESSON.sibling-audit-overlap=k015-family parallel dispatch on #3297 + #3298 produced k323 add-backlog.md cross-PR overlapWAVE.LESSON.agent-narrative-unreliable=k095/k324 confirmed at scale: 5 of 8 agents terminated mid-monitor with stale claims requiring direct verificationWAVE.LESSON.k101-still-trips=even after CONTEXT.md k101 reinforcement, agent of record posted self-PR comment on close; k331 adds explicit close-time literal-instruction guard