feat(analytics): add paginated list methods and list params types

[codexhange]

Adds AnalyticsResource.listAgents/listBudgets backed by page-aware endpoints and AnalyticsListParams/PaginatedResponse types.

Closes #127

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[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #127.
Verdict: clean

The pull request correctly implements pagination parameters, paginated response types, and analytics list methods with accompanying unit tests as specified in issue #127.

Reviewed commit: 2ed3db8ce5434a57f4b1c4e13cdb2ea7c2e858b6.
CI and merge eligibility are checked separately.

[mergekeeper]

MergeKeeper merge status

Status: blocked
PR state: open
Mergeability: conflicts / not mergeable
Checked commit: 2ed3db8ce5434a57f4b1c4e13cdb2ea7c2e858b6.

Reason: One or more required CI checks failed.

Failing checks:

• typecheck - view details

Next steps:

1. Open the failing check details above and fix the reported error.
2. Run the same checks locally where possible.
3. Commit and push the fix.
4. MergeKeeper will automatically re-review the updated PR.