Maintain compatibility for centralized deployments during federation rollout

[touchthesun]

Ensure OHM continues to operate in fully centralized mode while federation features are introduced. This enables gradual adoption and safe rollbacks.

Acceptance Criteria

• Centralized mode preserved as default
• Feature flags for federation enabled/disabled
• No breaking changes to existing API/CLI
• Documentation on centralized vs federated modes

Dependencies

• Issue 5.1.1 (topology definitions)

Estimated Effort

S (2-3 days)

Technical Notes

Use configuration flags to disable federation modules.

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Generated from notes/github-issues.md — Issue 5.6.1