Fix native model imports and test generator configuration parity

[urbankrepel-povio]

Native module-local output could import a schema directly while referencing CommonModels, causing ReferenceError at module load. The original parity CI missed that layout. Fix model ownership/imports and expand CI to exercise 236 configurations against two checked-in schemas.

The matrix covers all 64 layout combinations (48 valid, 16 explicitly rejected contradictory placements), representative values for every other renderer option, and transport/import interactions. It compares exact file lists and SHA-256 hashes across JavaScript/native on Linux/macOS. Native tests assert the binding is actually invoked, distinguish full and hybrid routes, and include empty/rejected cases in the manifest contract. Generated models are loaded across all valid layouts, and runner integration covers YAML/JSON input, cleanup, preservation of user files, and unchanged writes.

The expanded cases also fix unsplit naming/tag behavior, shared and module-local ownership, custom suffix imports, standalone imports, request-config forwarding, empty client import paths, and description handling. Model namespace routing preserves URL strings and validation regexes. Both demo fixtures include shared-schema regressions; the configuration fixture activates ACL, pagination, builders, defaults, descriptions, deprecated endpoints, and domain errors.

Validation: full JS and native test suites, Rust regression test, typecheck, lint, TypeScript/native release builds, and local exact-hash comparison of 4,320 generated files across 472 fixture/configuration cases. Cross-platform checks run in the separate Renderer parity workflow. Arbitrary option strings/lists use representative values; generated runtime execution covers models. incremental remains a compatibility option with identical unchanged-write behavior for both values.