docs: REUSE.md introduced — reuse map (hub+website+scripts+manifests) + reuse_refs_check.py gate + consolidated cross-repo REPORT

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

scripts/CHANGELOG.md

@@ -1,5 +1,13 @@
 # Felhom scripts — Changelog
 
+## reuse_refs_check.py — new gate: REUSE.md citation checker (2026-07-03)
+
+Staleness defense for the new per-repo `REUSE.md` reuse maps. Takes repo roots as argv, extracts
+every cited `*.go/*.py/*.html/*.css/*.yml/*.yaml/*.sh` path (slash-containing tokens only — bare
+filenames are conventions, not citations), verifies each exists; prints offenders, non-zero exit on
+any missing path. Symbols are spot-verified by the reviewer, not this script.
+Usage: `python scripts/reuse_refs_check.py <repo-root> [...]`.
+
 ## felhom-host-install.sh v1.8.0 — install the guarded-mkfs wrapper (Impl-1 Part B) (2026-07-01)
 
 Companion to felhom-agent v0.54.0 (format-safety foundation). During agent install, fetch + install the