Update Poolside Laguna model metadata

[grikomsn]

Summary

• Update the static Laguna catalog with the verified context and output limits:
  • M.1: 262,144 / 32,768
  • XS 2.1: 262,144 / 32,768
  • S 2.1: 1,048,576 / 131,072
• Preserve those verified limits when live Poolside /models discovery reports incomplete or stale values.
• Document the limits and reasoning modes, add a patch changeset, and cover the stale S 2.1 metadata case.

Validation

• npm run check
• npm run package

All 42 tests pass and typecheck succeeds.

[pullfrog]

✅ No new issues found.

Reviewed changes This review covers the updated Poolside Laguna metadata, its live-discovery merge behavior, documentation, release note, and regression tests.

• Laguna S 2.1 limits Updates the static catalog to advertise the larger verified context and output limits.
• Discovery preservation Keeps known-model limits from the static catalog when processing Poolside model responses, while retaining live metadata for other capabilities.
• Documentation and coverage Documents the model limits and reasoning modes, adds a patch changeset, and tests stale S 2.1 metadata.

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