Typed page classes that rebuild typed params, not URL strings

[OmarAlJarrah]

Problem (spike)

Cursor-based next-page navigation should rebuild a typed params object, not splice a URL.

Proposed change

Generate page types whose nextPage() calls the operation again with params.toBuilder().<cursor>(…).build() — cursor carried in a typed param, no URL surgery. Requires the operation-params SPI. Keep the existing strategy-based RequestRebuilder as the bring-your-own path.

Prior art: openai-java's generated *Page types.

Acceptance

• Typed-param next-page generation
• No URL string surgery in generated paging

Depends on the operation-params SPI.

Dependencies

• Blocked by Define a minimal OperationParams SPI feeding the context chain #57 — OperationParams SPI
• Blocked by Unify the two pagination stacks into one #30 — pagination-stack unification
• Related Async pagination support #34 — async pagination (if async paging is generated)

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Priority: high · Effort: large