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/code-clean/SKILL.md

@@ -7,7 +7,7 @@ description: |
   Trigger: "code-clean", "clean up the code", "remove dead code",
   "enforce code style", "cleanup", "nettoyage du code", "code hygiene".
   For targeted refactoring without audit → use /refactor instead.
-  For bug fixes discovered during cleanup → logged to BUGS-FOUND.md, not fixed here.
+  For bug fixes discovered during cleanup → logged to .claude/audits/BUGS-FOUND.md, not fixed here.
 argument-hint: <file, directory, or blank for entire project>
 disable-model-invocation: false
 allowed-tools: