feat(generator)!: emit unknown for unresolvable return types; honest bytes/set mappings

[bbopen]

Summary

• Preserve qualified Python class paths in IR so generation can distinguish local declarations from imports.
• Emit unknown for generated annotation leaves that lack a local declaration, including NewType, Decimal, complex, and external classes.
• Report each degradation through the existing unknown-type warning path and make the menagerie fixtures typecheck.

Local plain classes and dataclasses such as Point remain typed to document intent, while their loud serializer failure remains the catalogued Class-C residual for #268 or future serialization work.

The accepted numpy preset is explicitly a no-op in 0.9: ndarray returns honestly degrade to unknown until #268 can validate a faithful static shape.

BREAKING CHANGE

Generated output now contains more unknown types where tywrap cannot honestly emit a declared TypeScript type. --fail-on-warn may newly fail because these generated-type degradations are reported; that is intentional.

Closes #267

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 4f1a94e0-20c0-4728-8adf-30641cdc1bd9

📥 Commits

Reviewing files that changed from the base of the PR and between 360f2e7 and 10a597f.

⛔ Files ignored due to path filters (1)

• test/menagerie/__snapshots__/gen.test.ts.snap is excluded by !**/*.snap

📒 Files selected for processing (16)

• src/config/index.ts
• src/core/annotation-parser.ts
• src/core/generator.ts
• src/core/mapper.ts
• src/types/index.ts
• src/tywrap.ts
• test/annotation-parser.test.ts
• test/e2e_smoke.test.ts
• test/generator.test.ts
• test/menagerie/gen.test.ts
• test/menagerie/manifest.ts
• test/menagerie/roundtrip.test.ts
• test/type_mapping_advanced.test.ts
• test/type_mapping_property.test.ts
• tywrap_ir/tests/test_ir_return_honesty.py
• tywrap_ir/tywrap_ir/ir.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/0.9-267-unknown-returns

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