fix: Leave pagination params out of the at least one parameter guard

[razor-x]

What

The "at least one parameter is required" guard counted every parameter, so seam.access_codes.list(limit=20) satisfied a guard whose purpose is to require a filter, a page cursor alone satisfied it from page two onward, and create_paginator had a second hand-written copy with the same defect (SDK audit finding M7; ports JS #1008 / PHP #474 — pagination knobs are not filters).

• The codegen layout now computes an explicit atLeastOneParameterNames list — the endpoint's parameters minus limit and page_cursor, and only for endpoints where every parameter is optional (the same computation as the JS SDK). The generated guard checks exactly those names; nothing is emitted when the list is empty.
• Endpoints with an individually required parameter drop the blanket guard entirely — Python's own signature already enforces those, so the old if not payload there was dead code (JS made the same call). Their docstrings also lose the now-wrong :raises ValueError line.
• @route_metadata carries at_least_one_parameter_names instead of the boolean has_required_parameters, and both create_paginator guards (sync and async) consult the names, fixing the {"limit": 20} and page-cursor escapes there too.

This is a template + layout change; all route-file changes are regenerated output (guard raise sites go from 50 to 20 across the tree — the other 30 were the dead blanket guards).

Stacked on #638 (both edit the same route-method template); diff shrinks as the stack merges.

Testing

New test/required_parameters_test.py (sync + async): limit-only and page_cursor-only calls raise with the pinned message on both the route method and create_paginator; a real filter passes and paginates; the unpaginated events.list(limit=5) raises.

Revert check: with the old generated stack restored, the new tests fail with DID NOT RAISE ValueError — the audit's silent-pass symptom.

Full suite: 225 passed; mypy, pylint (10.00), black clean; regeneration is drift-free.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Y1RzepycXEYA3LStfjt8cY

---

Generated by Claude Code