Phase 5: Migrate bootstrap and discovery tests

Create organized test structure for proactive sync:

tests/common/sync_helpers.rs (from Phase 4):
- TestClient with retry logic for connect/send
- Event builders: build_layer2_issue_event, build_layer3_comment_event
- Tag variants (a/A/q for Layer 2, e/E/q for Layer 3)
- wait_for_event_on_relay() assertion helper
- repo_coord() utility function
- Unit tests for all builders

tests/sync/mod.rs:
- Module organization for sync tests
- Documentation of test categories

tests/sync.rs:
- Main test harness including common and sync modules

tests/sync/bootstrap.rs:
- test_bootstrap_syncs_existing_layer2_events (Test 1)
- test_relay_replays_events_after_restart (Test 4)

tests/sync/discovery.rs:
- test_discovers_layer3_via_layer2 (Test 2)
- test_layer2_discovery_with_chain (Test 3 - simplified)

All 14 tests pass: cargo test --test sync

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