test+docs: include 'intent' in the app-type ladder (22->23)

Add intent to app-types.test.ts (count 22->23, type list, slot-count map=9)
and update the ladder-count comments in slots.ts + the test header. intent is
a non-detectable type (builder-produced), alongside about/encyclopedia.
35/35 app-type tests pass.

Author: Wolfe-Jam

src/core/slots.ts

@@ -136,9 +136,10 @@ export function isPlaceholder(value: unknown): boolean {
   return false;
 }
 
-/** App-type to active category mapping. The canonical 22-type ladder —
+/** App-type to active category mapping. The canonical 23-type ladder —
  *  20 detectable apps + `about` (non-app, 0 slots, owner-attested)
- *  + `encyclopedia` (curated knowledge surface, FAFipedia and similar).
+ *  + `encyclopedia` (curated knowledge surface, FAFipedia and similar)
+ *  + `intent` (human-intent seed from builder.faf.one, not auto-detected).
  *  (See v6.6.md doctrine memory + fafipedia-vs-grokipedia-architecture.)
  *  Sorted ascending by active slot count for readability.
  *

tests/core/app-types.test.ts

@@ -1,7 +1,7 @@
 /**
  * WJTTC — app-types canonical ladder (v6.6.0)
  *
- * ENGINE: locks the 22-type ladder, slot allocation, and the universal-
+ * ENGINE: locks the 23-type ladder, slot allocation, and the universal-
  *         category extension to small types (cli/library/mcp/frontend/
  *         data-science).
  *
@@ -32,16 +32,17 @@ const CATEGORY_SIZES: Record<SlotCategory, number> = {
   enterprise_ops: 3,
 };
 
-describe('WJTTC ENGINE: app-types canonical ladder (22 types)', () => {
-  test('exactly 22 types defined', () => {
-    expect(Object.keys(APP_TYPE_CATEGORIES).length).toBe(22);
+describe('WJTTC ENGINE: app-types canonical ladder (23 types)', () => {
+  test('exactly 23 types defined', () => {
+    expect(Object.keys(APP_TYPE_CATEGORIES).length).toBe(23);
   });
 
   test('all canonical types present', () => {
     const expected = [
       // 0 slots — non-app representation (v6.6.0)
       'about',
       // 9 slots — minimal
+      'intent',
       'documentation',
       'encyclopedia',
       'cli', 'library', 'sdk', 'wasm', 'html',
@@ -64,6 +65,7 @@ describe('WJTTC ENGINE: app-types canonical ladder (22 types)', () => {
 describe('WJTTC ENGINE: per-type slot allocation', () => {
   // Per v6.6.md — sorted ascending by slot count.
   const expectedSlotCounts: Record<string, number> = {
+    intent: 9,
     documentation: 9,
     encyclopedia: 9,
     cli: 12,