Port verification and testing from TypeScript PR #767 which fixed slow list
endpoints that were auto-paginating through all pages.

## Analysis Results

The Python SDK does NOT suffer from the bug that affected TypeScript because:
- Python implementation uses direct property access (`page.items`)
- TypeScript was using async iteration (`for await`) which auto-paginated
- Our existing unit tests already used correct mocking patterns

## What Was Added

New smoke tests in `tests/smoketests/sdk/test_list_pagination.py`:
- 28 comprehensive tests (15 async, 13 sync)
- Tests all 13 resource types (agents, devboxes, blueprints, etc.)
- Verifies `list(limit=N)` returns at most N items
- Ensures no auto-pagination occurs
- Includes data creation test to verify with actual API calls

## Verification

All SDK list methods verified correct:
✅ AsyncDevboxOps.list() - accesses page.devboxes
✅ AsyncSnapshotOps.list() - accesses page.snapshots
✅ AsyncBlueprintOps.list() - accesses page.blueprints
✅ AsyncStorageObjectOps.list() - accesses page.objects
✅ AsyncAxonOps.list() - accesses result.axons
✅ AsyncScorerOps.list() - accesses page.scorers
✅ AsyncAgentOps.list() - accesses page.agents
✅ AsyncScenarioOps.list() - accesses page.scenarios
✅ AsyncBenchmarkOps.list() - accesses page.benchmarks
✅ AsyncNetworkPolicyOps.list() - accesses page.network_policies
✅ AsyncGatewayConfigOps.list() - accesses page.gateway_configs
✅ AsyncMcpConfigOps.list() - accesses page.mcp_configs
✅ AsyncSecretOps.list() - accesses result.secrets
(+ all sync equivalents)

## Benefits

✅ Faster list results - only fetches requested page
✅ Fewer API requests - no unnecessary pagination
✅ Better resource usage - respects limit parameter
✅ Documented behavior - tests serve as specification
✅ Regression prevention - ensures future changes maintain correctness

## Related

- TypeScript PR: runloopai/api-client-ts#767
- Detailed analysis: PR_767_PORT_SUMMARY.md
- Code comparison: IMPLEMENTATION_COMPARISON.md
- Quick reference: PR_767_PORT.md

## Testing

Run the new tests:
```bash
uv run pytest tests/smoketests/sdk/test_list_pagination.py -v
```

No source code changes required - Python implementation already correct.