feat: make FEATURE_ROADMAP a living doc — dev definition-of-done + audit default

Mike's decision (2026-05-27): the roadmap is a maintained status-and-plan
tracker ([ ]=planned, [x]=shipped, dated), consulted going in and updated
coming out.

- gururmm-development-principles memory: new "Living Roadmap (MANDATORY)"
  principle — consult before building, update the entry in the SAME change
  when shipping/modifying; roadmap update is part of definition-of-done.
  Dev is the primary maintainer; the audit is the backstop.
- rmm-audit skill: state the convention explicitly — the roadmap pass
  default is reconcile-and-flip (not annotate-only).

(Companion gururmm-repo changes — DESIGN.md principle + baseline checkbox
reconcile — pushed separately to the gururmm repo.)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/skills/rmm-audit/SKILL.md

@@ -534,6 +534,13 @@ Apply Agent F's reconciliation to `docs/FEATURE_ROADMAP.md` — this is the road
 cleanup the audit is responsible for. The roadmap is a living doc, so editing it fits
 the "living docs are updated" exception to read-only.
 
+**Convention (decided 2026-05-27):** FEATURE_ROADMAP.md is a maintained status-and-plan
+tracker — `[ ]` = planned, `[x]` = shipped (dated). Dev work is the primary maintainer
+(updating roadmap entries is part of GuruRMM definition-of-done — see
+`gururmm-development-principles`); this audit pass is the **backstop**. So the default IS
+to flip stale checkboxes (reconcile-and-flip), NOT annotate-only. Only fall back to
+annotate-only if the user explicitly requests it for a given run.
+
 - **STALE-INCOMPLETE → flip `[ ]` to `[x]`** for every item Agent F proved is shipped
   end-to-end. Keep the line text; optionally append `(verified <date>)`.
 - **PARTIAL → leave `[ ]`, append the scope annotation** Agent F recommends