Replace minutes-based task sizing with context-window percentage sizing.
Add planner_authority_limits section prohibiting difficulty-based scope
decisions. Expand decision coverage matrix to multi-source audit covering
GOAL, REQ, RESEARCH, and CONTEXT artifacts. Add Source Audit gap handling
to plan-phase orchestrator (step 9c). Update plan-checker to detect
time/complexity language in scope reduction scans. Add 374 CI regression
tests preventing prohibited language from leaking back into artifacts.
Closes#2091Closes#2092
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>