fix(updater): write models to settings.availableModels — v2.1.114+ removed CLAUDE_CUSTOM_MODELS env var

Root cause of "/model picker shows only 5 models": Anthropic removed
the CLAUDE_CUSTOM_MODELS env var sometime around v2.1.114. The picker
now reads exclusively from settings.json `availableModels` (a Zod-typed
allowlist field). We were:
  - Writing CLAUDE_CUSTOM_MODELS into env.* (no longer read)
  - Calling data.pop("availableModels", None) — actively REMOVING the
    field that the picker now needs

So the picker fell back to built-in models + the two ANTHROPIC_DEFAULT_*
models, giving exactly 4 entries. Confirmed via strings on the v2.1.119
SEA binary: zero hits for "CLAUDE_CUSTOM_MODELS", but Zod schema
defines availableModels as the model allowlist.

Fix:
- patch_user() writes config['models'] into data['availableModels']
  (still also sets the env var for backward-compat with side-by-side
  older binaries)
- Verification block in install.sh + updater.py now reports both:
    availableModels: N models  (env.CLAUDE_CUSTOM_MODELS legacy: N)

Tested locally on v2.1.119 SEA install → settings.json now contains
availableModels with all 19 models. Restart claude → /model should show
the full list.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

claude/uclaude_install.sh

@@ -179,13 +179,20 @@ try:
     s = json.load(open(sys.argv[1]))
     env = s.get("env", {})
     ccm = env.get("CLAUDE_CUSTOM_MODELS", "")
-    n = len(ccm.split(",")) if ccm else 0
+    n_env = len(ccm.split(",")) if ccm else 0
+    am = s.get("availableModels") or []
+    n_am = len(am) if isinstance(am, list) else 0
     print(f"    base_url:    {env.get('ANTHROPIC_BASE_URL','-')}")
     auth = env.get("ANTHROPIC_AUTH_TOKEN", "")
     print(f"    auth_token:  {auth[:8]}{'...' if auth else ' (NOT SET — auth will fail!)'}")
-    print(f"    custom_models: {n} models {'⚠ ZERO — /model will show built-ins only' if n==0 else 'OK'}")
-    if n > 0:
-        print(f"    sample:      {','.join(ccm.split(',')[:3])}...")
+    # SEA v2.1.114+ reads from settings.availableModels (settings.json),
+    # not env.CLAUDE_CUSTOM_MODELS. We log both: availableModels is the
+    # source of truth for the /model picker now.
+    status = "OK" if n_am > 0 else "WARN ZERO — /model will show built-ins only"
+    print(f"    availableModels: {n_am} models {status}")
+    print(f"    env.CLAUDE_CUSTOM_MODELS (legacy): {n_env} models")
+    if n_am > 0:
+        print(f"    sample:      {','.join(am[:3])}...")
 except Exception as e:
     print(f"    ERROR reading settings.json: {e}")
 PYEOF