refactor(audits): route all report writes to .claude/audits/

Before: SEO.md, GEO.md, HARDEN.md, VALIDATE.md, BUGS-FOUND.md landed
at project root. After: all five go to .claude/audits/. Covers both
dispatcher write paths and the dispatcher bash commands that parse
each report (test -s, grep score, wc) — otherwise the dispatcher
would look for the file at the old location.

- skills/seo,geo,harden,validate,code-clean — write paths + console
  summaries ("Report: .claude/audits/X.md")
- skills/harden,validate — bash parsing commands (test/grep/wc) aligned
- agents/seo-analyzer,validator-analyzer,code-cleaner — agent-side refs
- agents/validator-analyzer frontmatter description updated

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

skills/geo/SKILL.md

@@ -37,9 +37,9 @@ $ARGUMENTS
 
 ## Note on integration
 
-If `SEO.md` already exists at project root, the geo-analyzer will
+If `.claude/audits/SEO.md` already exists, the geo-analyzer will
 merge its findings into that file's `§7 — Optimisation GEO / IA`
 section (rather than writing a separate `GEO.md`). This keeps a
 single consolidated report when both /seo and /geo have been run.
 
-If no `SEO.md` exists, the agent writes `GEO.md` at project root.
+If no `.claude/audits/SEO.md` exists, the agent writes `.claude/audits/GEO.md` (run `mkdir -p .claude/audits` first).