gate: add kunchenguid/no-mistakes for all Nix harnesses

- home.nix: add home.activation.noMistakes (declarative install to
  ~/.no-mistakes/bin + daemon via launchd, global config fallback
  agent: [pi, opencode, grok, claude, codex] covering every harness
  declared in Nix; fix shadowing of jonathanong npm no-mistakes)
- ~/.no-mistakes/config.yaml: switched from auto to ordered fallback,
  pi first (firstmate crewmates), then opencode/grok
- home/.pi/agent/*, home/.grok/config.toml, home/.config/opencode2:
  align to oMLX/qwen3.6-35b local model (was mixed Talos/genesis)
- rebuild.sh: ensure grok-build upgrade and OpenCode 1.x install on
  rebuild (stable CLI for free-tier, opencode2 beta is 426 there)
- dotfiles repo: no-mistakes init (gate at
  ~/.no-mistakes/repos/916cb6ded81b.git, remote no-mistakes)

home/.pi/agent/settings.json

@@ -1,23 +1,13 @@
 {
   "lastChangelogVersion": "0.84.1",
   "theme": "rose-pine-moon",
-  "defaultProvider": "ornith",
-  "defaultModel": "ornith",
+  "defaultProvider": "omlx",
+  "defaultModel": "qwen3.6-35b",
   "models": [
     {
-      "name": "Genesis (Local)",
-      "provider": "genesis",
-      "model": "/models/Hermes3.6-35B-A3B-Uncensored-Genesis-V6-APEX.gguf"
-    },
-    {
-      "name": "Ornith 1.0 35B (Local)",
-      "provider": "ornith",
-      "model": "/models/ornith-1.0-35b-Q6_K.gguf"
-    },
-    {
-      "name": "Dagger Qwen3.6 27B MLX (M5)",
+      "name": "Qwen 3.6 35B (o4-mtp)",
       "provider": "omlx",
-      "model": "Dagger-Qwen3.6-27B-MLX"
+      "model": "Jundot/Qwen3.6-35B-A3B-oQ4-mtp"
     }
   ],
   "compaction": {
@@ -44,4 +34,4 @@
   "steeringMode": "all",
   "followUpMode": "all",
   "collapseChangelog": true
-}
+}