fix(ui-parser): emit as proper CJS subpackage so ESM named imports work

Paperclip's plugin-loader does ESM named imports of parseStdoutLine when
loading opencode_k8s, e.g.:

    import { parseStdoutLine } from "paperclip-adapter-opencode-k8s/ui-parser"

The previous esbuild bundle wrote CJS via __toCommonJS getters, which
cjs-module-lexer can't statically detect — Node fails the link with:

    SyntaxError: The requested module './ui-parser.js' does not provide
    an export named 'parseStdoutLine'

Also, with the package.json `"type": "module"` field, dist/ui-parser.js
was being interpreted as ESM by the loader, compounding the failure.

Fix: emit ui-parser as a proper CJS sub-package.

- Move output to dist/ui-parser/ui-parser.js
- Generate dist/ui-parser/package.json with `{"type":"commonjs"}` so Node
  treats the file as CJS regardless of the parent type:module
- Use `tsc -p tsconfig.ui-parser.json` (module: commonjs) instead of
  esbuild — the output is plain `exports.parseStdoutLine = parseStdoutLine`
  which cjs-module-lexer detects natively
- Update the exports map: `"./ui-parser": "./dist/ui-parser/ui-parser.js"`
- Drop the esbuild devDependency

Verified locally:
- `import { parseStdoutLine } from "...ui-parser"` works (Node 25)
- Read-file-as-text + `new Function(...)` worker pattern still works
- 382/382 tests pass; typecheck clean

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -10,7 +10,7 @@
   "exports": {
     ".": "./dist/index.js",
     "./server": "./dist/server/index.js",
-    "./ui-parser": "./dist/ui-parser.js",
+    "./ui-parser": "./dist/ui-parser/ui-parser.js",
     "./cli": "./dist/cli/index.js"
   },
   "files": [
@@ -18,7 +18,7 @@
   ],
   "scripts": {
     "build": "tsc -p tsconfig.build.json && npm run build:ui-parser",
-    "build:ui-parser": "esbuild src/ui-parser.ts --bundle --format=cjs --target=es2020 --outfile=dist/ui-parser.js --log-level=warning",
+    "build:ui-parser": "tsc -p tsconfig.ui-parser.json && node -e \"require('node:fs').writeFileSync('dist/ui-parser/package.json', '{\\\"type\\\":\\\"commonjs\\\"}\\n')\"",
     "clean": "rm -rf dist",
     "typecheck": "tsc --noEmit",
     "test": "vitest run",
@@ -35,7 +35,6 @@
     "@paperclipai/adapter-utils": "^2026.428.0",
     "@types/node": "^24.6.0",
     "@vitest/coverage-v8": "^4.1.5",
-    "esbuild": "^0.24.0",
     "typescript": "^5.7.3",
     "vitest": "^4.1.4"
   }