refactor(core): centralize lint result adaptation

[luojiyin1987]

Summary

• Add one adapter for core lint results.
• Use it for stdin lint and fix paths.
• Use it for worker lint and fix paths.
• Add direct adapter tests.

Why

The CLI mapped the same core fields in three places.

A shared adapter keeps this boundary consistent.

The adapter excludes core diagnostics from BatchLintItem.

Impact

CLI output and exit behavior stay unchanged.

Lint results now include fixedResult with a null value.

Validation

• npm run typecheck
• Prettier check for changed files
• npm test -- --runInBand
• 24 test suites passed
• 186 tests passed

Closes #137