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>

agents/seo-analyzer.md

@@ -877,7 +877,7 @@ SEO AGENT RESULT (depth: <LOCAL|FULL>)
 ```
 
 **If standalone `/seo` on a project without `/geo`**: write/update
-`SEO.md` at project root. Structure matches classic format, with §7
+`.claude/audits/SEO.md` (run `mkdir -p .claude/audits` first). Structure matches classic format, with §7
 (GEO) marked as "Not audited — run /geo for GEO/AI optimization".
 
 ```markdown