entities: document move, consolidate, merge + gotchas section
Three commands shipped to production without matching skill updates:
- move (3/18, commit 064c50e2) — cross-facet entity moves
- consolidate (4/17, commit 9730cd6d) — roll segment detections into journal entities
- merge (4/17, commit c9c1c8a9) — dedup two journal entities, preview-by-default
Add sections for each plus a Gotchas block calling out merge's --no-commit
default, consolidate's 85% fuzzy threshold, and the detect-vs-observe split.
Add Invoke via Bash line and expand TRIGGER with literal command names.
Part of skills audit req_loq3e2lk pass 1+2.