fix(gen): small config scrubs — openclaw blobs to real files, setup host drift, dead artifacts

- The three openclaw markdown blobs hardcoded inside gen-skill-docs.ts (which
  silently reverted any hand edit to their tracked outputs on regen) move to
  openclaw/templates/*.md source files; output shasums byte-identical.
- setup's --host allowlists gain cursor + slate — both fully registered hosts
  with generated output, but './setup --host cursor' exited 1 because two
  hand-rolled lists in setup had drifted from hosts/index.ts.
- scripts/proactive-suggestions.json deleted: 31KB regenerated on every run,
  read by nobody (the catalog-trim design's reader was never built); its
  emitter and three determinism tests (which guaranteed a file nothing reads
  didn't churn) retired with stays-retired pins.
- claude/SKILL.md.tmpl deleted: a complete 8.9KB skill that never generated
  output (directory name collides with the host id 'claude'), in no registry.
  Recoverable from git if ever wanted under a non-colliding name.
- openclaw's frozen extraFields.version '0.15.2.0' stamp dropped;
  includeSkills: [] no-ops omitted (the generator treats [] as absent);
  llms.txt 55 -> 54 skills.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/gen-skill-docs-out-dir.test.ts

@@ -66,7 +66,7 @@ describe('gen-skill-docs --out-dir (B2 render isolation)', () => {
     }
   });
 
-  test('global extras (proactive-suggestions.json) are NOT written in out-dir mode', () => {
+  test('retired global extras (proactive-suggestions.json) are not written anywhere', () => {
     const outDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-out-'));
     try {
       const res = spawnSync(
@@ -75,8 +75,10 @@ describe('gen-skill-docs --out-dir (B2 render isolation)', () => {
         { cwd: ROOT, encoding: 'utf-8', timeout: 120_000 },
       );
       expect(res.status).toBe(0);
-      // proactive-suggestions.json lives at a repo path; out-dir mode must skip it.
+      // The proactive-suggestions registry was removed (never had a consumer).
+      // A gen run must not resurrect it in the out-dir or at the repo path.
       expect(fs.existsSync(path.join(outDir, 'scripts', 'proactive-suggestions.json'))).toBe(false);
+      expect(fs.existsSync(path.join(ROOT, 'scripts', 'proactive-suggestions.json'))).toBe(false);
     } finally {
       fs.rmSync(outDir, { recursive: true, force: true });
     }