feat(generator): build full SDK generation foundation

[nmorgan-cb]

Description

Builds the foundation for deterministic, full Prime Java SDK generation from the committed OpenAPI specification.

• Adds SpecParser, which captures operation IDs, HTTP methods, paths, tags, merged parameters, request/response schemas, numeric 2xx statuses, summaries, and optional SDK naming extensions from apiSpec/prime-public-spec.yaml.
• Adds immutable SpecModels and OperationBinding metadata for subsequent request, response, service, and factory generation phases.
• Adds deterministic operation binding derivation, including tag-based service ownership, request omission, pagination, existing Java naming compatibility, and Travel Rule → Transactions routing.
• Adds validation for exact operation coverage, stable binding order, duplicate Java service methods, and undeclared path parameters.
• Adds checked-in generator configuration and sparse operation-override boundary.
• Ignores local docs/ agent-planning artifacts so they do not enter the public repository.

This consolidated PR supersedes the former stacked PRs #8 and #9. It intentionally does not yet replace the existing handwritten DTO/service sources; the parser and binding contract must be accepted before enabling client-surface source replacement.

Generated with Toshi

Type of Change

• Bug fix
• New feature
• Breaking change
• Dependency update
• Refactor / cleanup
• Other (describe below)

Checklist

• Tests included / updated
• Changelog updated
• Version bump if needed

[cb-heimdall]

🟡 Heimdall Review Status

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Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1