docs: REUSE.md introduced — cross-repo reuse map (canonical helpers/patterns/traps/seams; docs-only, no version bump)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6

CHANGELOG.md

@@ -1,5 +1,14 @@
 ## Changelog
 
+### docs — REUSE.md introduced (2026-07-03)
+
+Cross-repo reuse-map rollout (docs-only, no code change, no version bump). New `REUSE.md` at the
+repo root: curated map of canonical helpers (62 rows), patterns, dangerous lookalikes (rsyncMirror
+`--delete`, raw os.RemoveAll on drive paths, fresh agentapi.New per request…), test seams, extension
+points, and observed duplication (12 clusters, NOT fixed). Every entry code-verified at file+symbol;
+cited paths machine-checked by `felhom.eu/scripts/reuse_refs_check.py` (green). CLAUDE.md gains the
+"See REUSE.md before writing new code" pointer + the same-commit maintenance rule.
+
 ### v0.98.3 — hide "Eltávolítás a listából" on wizard-enrolled drives (2026-07-02)
 
 User feedback follow-up: list-removal (registry-entry delete; data + mount untouched) is only