feat: integrate 5 feature branches, upstream fixes, and MIME detection fix

Squashed 5 commits:

Features (from 5 feature branches):
- MCP fix, pipe mute, stub recovery
- KAIROS activation, openclaw autonomy
- Daemon/job command hierarchy + cross-platform bg engine

Upstream fixes:
- fix: Bun.hash compatibility
- chore: chrome dependency update
- docs: browser support guide

MIME detection fix:
- Screenshot detectMimeFromBase64(): decode raw bytes from base64
  instead of broken charCodeAt comparison
- Fixes API 400 on Windows (JPEG) and macOS (PNG) screenshots

package.json

@@ -55,7 +55,7 @@
     "rcs": "bun run scripts/rcs.ts"
   },
   "dependencies": {
-    "@claude-code-best/mcp-chrome-bridge": "^2.0.6"
+    "@claude-code-best/mcp-chrome-bridge": "^2.0.7"
   },
   "devDependencies": {
     "@types/he": "^1.2.3",