Implement manual federation sync and peer status surface

[enricopiovesan]

Summary

• implement manual federation operator commands for peer listing, sync, and status rendering in the CLI
• restore the missing federation registry foundation needed by the operator surface
• keep the slice scoped to federation operator behavior and validation on top of current main

Testing

• cargo test -p traverse-registry
• cargo test -p traverse-cli
• bash scripts/ci/rust_checks.sh
• bash scripts/ci/repository_checks.sh
• bash scripts/ci/coverage_gate.sh

Project Item

• Implement manual federation sync and peer status surface #241

Governing Spec

• 001-foundation-v0-1
• 005-capability-registry
• 007-workflow-registry-traversal
• 011-event-registry
• 017-ai-agent-packaging
• 018-event-driven-composition

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