fix(worma): isolate schema workers per generator

[LittleTurtle2333]

Summary

• isolate schema worker pools by each generator output directory
• prevent concurrent OpenAPI generators from resolving refs against another document
• add a two-generator regression test using distinct MallActivity and AdminUser schemas
• document the isolation contract and add a patch changeset

Root cause

Schema workers were cached only by projectPath even though workerData permanently captures one OpenAPI document. Multiple generators in the same project could therefore reuse the wrong document context, causing timing-dependent missing-ref failures or false success when processBatch calls overlapped.

Validation

• pnpm --filter wormajs test: 63 files passed, 777 tests passed, 6 skipped
• pnpm --filter wormajs build
• ESLint on the changed source and regression test

[changeset-bot]

🦋 Changeset detected

Latest commit: e2d9728

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
wormajs	Patch

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