refactor(eval): rename /audit skill to /agent-eval

Renames the `.claude/skills/audit/` directory and all internal references to `agent-eval`, aligning the skill name with the `/agent-eval` command it invokes.

.claude/skills/audit/SKILL.md → .claude/skills/agent-eval/SKILL.md

@@ -1,6 +1,6 @@
 ---
-name: audit
-description: Benchmark CodeGraph retrieval quality on a real codebase by comparing agent behavior with vs without CodeGraph. Use when the user runs /audit or asks to test, benchmark, audit, or validate a codegraph version (the local dev build or a published npm version) against a language's repo.
+name: agent-eval
+description: Benchmark CodeGraph retrieval quality on a real codebase by comparing agent behavior with vs without CodeGraph. Use when the user runs /agent-eval or asks to test, benchmark, audit, or validate a codegraph version (the local dev build or a published npm version) against a language's repo.
 ---
 
 # CodeGraph Quality Audit
@@ -32,7 +32,7 @@ user type a specific version (e.g. `0.7.10`). Map the answer to a VERSION token:
 - "Latest published" → `latest`
 - a typed version → that string (e.g. `0.7.10`)
 
-**Step 2 — language.** Read `.claude/skills/audit/corpus.json`. Ask with
+**Step 2 — language.** Read `.claude/skills/agent-eval/corpus.json`. Ask with
 `AskUserQuestion` which language to test, listing the languages that have entries.
 
 **Step 3 — repo.** From the chosen language's entries, ask which repo. Label each

.claude/skills/audit/corpus.json → .claude/skills/agent-eval/corpus.json

@@ -1,5 +1,5 @@
 {
-  "_comment": "Test corpus for /audit. Add entries freely. size: Small (<~150 files), Medium (~150-1500), Large (>~1500). 'question' is a representative architectural question that exercises cross-file understanding.",
+  "_comment": "Test corpus for /agent-eval. Add entries freely. size: Small (<~150 files), Medium (~150-1500), Large (>~1500). 'question' is a representative architectural question that exercises cross-file understanding.",
   "TypeScript": [
     { "name": "ky", "repo": "https://github.com/sindresorhus/ky", "size": "Small", "files": "~25", "question": "How does ky implement request retries and timeouts?" },
     { "name": "excalidraw", "repo": "https://github.com/excalidraw/excalidraw", "size": "Medium", "files": "~600", "question": "How does Excalidraw render and update canvas elements?" },