fix(spawn): seed todos[] into builder template .trinity/local.json (TDPLAN-0007 follow-up)

Verification audit caught a gap: spawn create copies templates/builder/ tree
directly (DEFAULT_TEMPLATE), but builder/.trinity/local.json lacked the todos[]
schema — so freshly spawned branches would not inherit it. Seeded todos[] +
max_todos:10 + todo_text_max_chars:200 + operational note to match @memory's
LOCAL.template.json. Now both spawn-create and template-push paths produce
todos[].

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/aipass/spawn/templates/builder/.spawn/.template_registry.json

@@ -86,7 +86,7 @@
     "f012": {
       "path": ".trinity/local.json",
       "name": "local.json",
-      "content_hash": "df2ba4a97f0a",
+      "content_hash": "8f8a98e42d92",
       "has_branch_placeholder": false
     },
     "f013": {
@@ -149,7 +149,7 @@
       "content_hash": "a4cf0a8e3b4f",
       "has_branch_placeholder": false
     },
-    "f018": {
+    "f015": {
       "path": "apps/modules/__init__.py",
       "name": "__init__.py",
       "content_hash": "e3b0c44298fc",
@@ -263,7 +263,7 @@
       "content_hash": "28e9ae373563",
       "has_branch_placeholder": false
     },
-    "f015": {
+    "f018": {
       "path": "apps/plugins/__init__.py",
       "name": "__init__.py",
       "content_hash": "e3b0c44298fc",

src/aipass/spawn/templates/builder/.trinity/local.json

@@ -17,7 +17,9 @@
       "max_key_learnings": 25,
       "session_summary_max_chars": 150,
       "learning_value_max_chars": 200,
-      "note": "DO NOT trim, prune, or delete entries. Rollover to @memory handles overflow automatically. Just add new entries."
+      "note": "DO NOT trim, prune, or delete entries. Rollover to @memory handles overflow automatically. Just add new entries. todos[] is OPERATIONAL — never vectorized/trimmed by rollover; completing/removing a todo is normal.",
+      "max_todos": 10,
+      "todo_text_max_chars": 200
     },
     "status": {
       "health": "healthy",
@@ -25,6 +27,7 @@
       "current_lines": 0
     }
   },
+  "todos": [],
   "key_learnings": {},
   "sessions": [
     {
@@ -34,4 +37,4 @@
       "status": "completed"
     }
   ]
-}
+}