Fix JSON Schema comment injection in generated code

[schani]

Summary

• Add JSON Schema fixtures that reproduce comment injection through schema descriptions.
• Add a parser-only tree-sitter regression fixture that loops over covered generated languages.
• Normalize description line endings before comment emission.
• Centralize comment delimiter escaping in emitCommentLines/emitComments so renderers do not need to escape manually.
• Escape C-style (*/), Elm/Haskell (-}), and triple-quoted (""") documentation comments.
• Add focused comment-injection fixtures to PR CI.

CI coverage

The PR workflow now includes a dedicated row for:

• comment-injection-treesitter
• comment-injection-typescript
• comment-injection-typescript-zod
• comment-injection-typescript-effect-schema

Existing schema fixture rows also pick up the new schema samples for languages that already run schema-* in CI.

Not yet in CI: Objective-C comment-injection fixture, because Objective-C is currently disabled/commented out in the workflow. PHP is covered by the tree-sitter parser fixture, not a runtime fixture.

Validation run locally

• npm run build
• npx tsc -p test/tsconfig.json --noEmit
• CPUs=1 QUICKTEST=true FIXTURE=comment-injection-treesitter npm test -- test/inputs/schema/comment-injection.schema
• CPUs=1 QUICKTEST=true FIXTURE=schema-typescript npm test -- test/inputs/schema/comment-injection.schema
• CPUs=1 QUICKTEST=true FIXTURE=comment-injection-typescript npm test
• CPUs=1 QUICKTEST=true FIXTURE=comment-injection-typescript-zod npm test
• CPUs=1 QUICKTEST=true FIXTURE=comment-injection-typescript-effect-schema npm test
• CPUs=1 QUICKTEST=true FIXTURE=comment-injection-treesitter,comment-injection-typescript,comment-injection-typescript-zod,comment-injection-typescript-effect-schema npm test

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[devin-ai-integration]

Devin Review found 2 potential issues.