[bbopen]

Scope

• Add an importable Python Point fixture and use analyzer IR as the compiler input.
• Derive the prototype dataclass identity and field rules from that IR and the resolved callable contract.
• Execute the compiler-generated Promise<Point> wrapper through an explicit bound runtime provider.
• Check the required defaulted field, capability and adapter failures, exact decoded fields, and generated return validation.
• Keep the exact-integer and dataclass codecs isolated under test/prototypes.

Verification

• Full exact-head CI: https://github.com/bbopen/tywrap/actions/runs/35501416689 (passed).
• Targeted Python prototype suite: 23 passed.
• Independent review of the earlier analyzed-IR correction: accepted as bounded prototype evidence.

Limits

The default runtime has no dataclass adapter. The generated structural validator checks required field values; the bound prototype adapter checks wire identity and exact fields. Production still needs bridge capability negotiation and a server-side compiled field contract. This PR is a design proof for #339 and does not close the issue.

Stacked on draft #347. Prototype work is also tracked in draft #349.

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[bbopen]

Integrated through reviewed implementation PR #362, merged as 43f111b43fbb0ce31dcb59f8fb489e8dadf3f191. This branch head is an ancestor of that merged commit. Final combined release candidate aa5497f867b36a76670afedbe9b34a6712a322e3 passed full CI 35508107651. Closing this component PR because its work is already on main; release publication is tracked by #354.