feat(cli): add self-update service

Check the npm registry (at most once per 24h, file-locked) for newer
@opencode-ai/cli releases and act on a host-level autoupdate policy read
from config. Apply patch updates automatically, confirm minor updates
interactively, and never auto-update across majors. Skip local installs
and honor the disable flag. Wired into the default TUI command
(interactive) and serve (background).

bun.lock

@@ -105,12 +105,15 @@
         "@opentui/solid": "catalog:",
         "@parcel/watcher": "2.5.1",
         "effect": "catalog:",
+        "jsonc-parser": "3.3.1",
+        "semver": "catalog:",
         "solid-js": "catalog:",
       },
       "devDependencies": {
         "@opencode-ai/script": "workspace:*",
         "@tsconfig/bun": "catalog:",
         "@types/bun": "catalog:",
+        "@types/semver": "catalog:",
         "@typescript/native-preview": "catalog:",
       },
     },
@@ -5975,6 +5978,8 @@
 
     "@openauthjs/openauth/jose": ["jose@5.9.6", "", {}, "sha512-AMlnetc9+CV9asI19zHmrgS/WYsWUwCn2R7RzlbJWD7F9eWYUTGyBmU9o6PxngtLGOiDGPRu+Uc4fhKzbpteZQ=="],
 
+    "@opencode-ai/cli/semver": ["semver@7.7.4", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA=="],
+
     "@opencode-ai/core/@ai-sdk/openai": ["@ai-sdk/openai@3.0.53", "", { "dependencies": { "@ai-sdk/provider": "3.0.8", "@ai-sdk/provider-utils": "4.0.23" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-Wld+Rbc05KaUn08uBt06eEuwcgalcIFtIl32Yp+GxuZXUQwOb6YeAuq+C6da4ch6BurFoqEaLemJVwjBb7x+PQ=="],
 
     "@opencode-ai/core/@ai-sdk/openai-compatible": ["@ai-sdk/openai-compatible@2.0.41", "", { "dependencies": { "@ai-sdk/provider": "3.0.8", "@ai-sdk/provider-utils": "4.0.23" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-kNAGINk71AlOXx10Dq/PXw4t/9XjdK8uxfpVElRwtSFMdeSiLVt58p9TPx4/FJD+hxZuVhvxYj9r42osxWq79g=="],