fix: Codex description limit + wrong-repo bug

Move skill routing table from root SKILL.md.tmpl description (1017/1024
chars) to body. Add 900-char warning threshold test to prevent future
creep. Add -C flag to all 14 codex exec calls so Codex always runs in
the correct git root. Fix pre-existing package.json version mismatch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/gen-skill-docs.test.ts

@@ -152,6 +152,24 @@ describe('gen-skill-docs', () => {
     }
   });
 
+  test('every Codex SKILL.md description stays under 900-char warning threshold', () => {
+    const WARN_THRESHOLD = 900;
+    const agentsDir = path.join(ROOT, '.agents', 'skills');
+    if (!fs.existsSync(agentsDir)) return;
+    const violations: string[] = [];
+    for (const entry of fs.readdirSync(agentsDir, { withFileTypes: true })) {
+      if (!entry.isDirectory()) continue;
+      const skillMd = path.join(agentsDir, entry.name, 'SKILL.md');
+      if (!fs.existsSync(skillMd)) continue;
+      const content = fs.readFileSync(skillMd, 'utf-8');
+      const description = extractDescription(content);
+      if (description.length > WARN_THRESHOLD) {
+        violations.push(`${entry.name}: ${description.length} chars (limit ${MAX_SKILL_DESCRIPTION_LENGTH}, ${MAX_SKILL_DESCRIPTION_LENGTH - description.length} remaining)`);
+      }
+    }
+    expect(violations).toEqual([]);
+  });
+
   test('package.json version matches VERSION file', () => {
     const pkg = JSON.parse(fs.readFileSync(path.join(ROOT, 'package.json'), 'utf-8'));
     const version = fs.readFileSync(path.join(ROOT, 'VERSION'), 'utf-8').trim();