Collapse Θ-W5 to wave-level in PLAN.md, append its narrative to COMPLETED.md, fix a stale resolvePlay reference in core/instrument/CLAUDE.md, and file the drag-off-margin and AttackEnd/Origin shadow warts in TODO.md.
Note-on latching rejected for continuous controls. New serial track ahead of
staged-envelope-curves (renumbered T2); edit-model and mid-stage-rule questions
left open for Daniel. Records two deferred filter follow-ups.
Move the landed filter-voice-path track from PLAN.md into COMPLETED.md with full
narrative (quantizer removal, editor floor raise). Mark Θ-W2 fully landed, matching
W1's phrasing; fix a stale forward reference.