fix(traverse): pg-proto-parser is a build-time dependency - #376

Summary

@pgsql/traverse listed pg-proto-parser under dependencies, but only scripts/pg-proto-parser.ts (build:proto) imports it. The published src/18/runtime-schema.ts mentions it only in its "generated by" header. Because the dependency was declared at runtime, every consumer of @pgsql/traverse also installed pg-proto-parser and its @launchql/protobufjs fork, plus @babel/*. That includes @pgsql/lint, @pgsql/transform, @pgsql/semantics and plpgsql-parser. It's the only reason the @launchql scope still shows up in downstream lockfiles and pnpm policies.

 "dependencies": {
   "@pgsql/types": "^18.0.0",
-  "pg-proto-parser": "workspace:*",
   "plpgsql-deparser": "workspace:*"
 },
 "devDependencies": {
-  "makage": "^0.5.1"
+  "makage": "^0.5.1",
+  "pg-proto-parser": "workspace:*"
 }

This matches how @pgsql/utils and @pgsql/transform-ast already declare it. The PR also replaces pg-proto-parser's npm description, which read "The LaunchQL Proto parser".

Verified:

• pnpm install --frozen-lockfile passes. The lockfile edit only moves the importer entry.
• packages/traverse/dist has no require/import of pg-proto-parser or protobufjs.
• The traverse jest suite passes (36/36).

After publish, downstream repos drop @launchql/protobufjs on their next @pgsql/* bump.

Link to Devin session: https://app.devin.ai/sessions/10c9e261a5334448b61df498ecd447d1
Open in Devin Desktop: https://app.devin.ai/desktop/session/10c9e261a5334448b61df498ecd447d1?variant=devin
Requested by: @pyramation