fix: reduce ListUsers MaxResults from 200 to 50 to prevent Lambda OOM/timeout

[c1-dev-bot]

Summary

• Reduces MaxResults for ListUsers from 200 to 50 to prevent Lambda OOM/timeout crashes on tenants with large Google Workspace directories
• ListUsers uses Projection("full") which returns extensive per-user data (organizations, custom schemas, relations, POSIX accounts, etc.) — with 200 users per page, directories with many custom-schema attributes can produce payloads large enough to exceed Lambda memory limits or trigger context deadline timeouts
• The crash manifests as FunctionError=Unhandled with status code: 200 because OOM/panic falls through the baton-sdk Lambda client's timeout detection logic at pkg/lambda/grpc/client.go:62-68 to the generic error format at line 75
• Reducing to 50 users per page bounds per-page payload size (~75% reduction) while maintaining correct pagination — the tradeoff is more API calls per sync, but each call completes safely within Lambda constraints

Context

This matches the pattern seen in CE-582 where an identical lambda_transport: Unhandled; status code: 200 error was caused by Lambda timeout on large directory listing. The affected tenant has never completed a successful full sync.

Test plan

• Verify the connector builds successfully
• CI passes
• Engineering should confirm via CloudWatch logs whether the crash is OOM or timeout to validate this fix addresses the root cause
• If OOM: this fix directly addresses it by reducing per-page memory usage
• If timeout: this fix helps by reducing per-page transfer and parse time; Lambda timeout increase may also be needed
• Deploy to affected tenant and verify sync completes

Fixes: CXH-1509

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Automated PR Notice

This PR was automatically created by c1-dev-bot as a potential implementation.

This code requires:

• Human review of the implementation approach
• Manual testing to verify correctness
• Approval from the appropriate team before merging

[linear-code]

CXH-1509

[github-actions]

Connector PR Review: fix: reduce ListUsers MaxResults from 200 to 50 to prevent Lambda OOM/timeout

Blocking Issues: 0 | Suggestions: 0 | Threads Resolved: 0
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Review Summary

This PR reduces the MaxResults parameter for ListUsers from 200 to 50 in pkg/client/client.go to prevent Lambda OOM/timeout crashes when syncing large Google Workspace directories with Projection("full"). The pagination mechanism via pageToken is unchanged, so correctness is preserved — this is a safe tuning change (B9). No security, correctness, or breaking change issues found.

Security Issues

None found.

Correctness Issues

None found.

Suggestions

None.

[github-actions]

No blocking issues found.