DA Logical Synchronizer Upgrades 76 Milestone 2: E2E Happy Path Orchestration

Milestone 2: E2E Happy Path Orchestration

| Estimated Delivery | Month 3 | | :---- | :---- | | Focus | Connecting the pieces to allow a successful migration under ideal conditions. |

Deliverables:

• Validator node logic to handle the SynchronizerSuccessor announcement.
• Automatic registration of the new synchronizer upon detection.
• Implementation of the "Tombstone" enforcement (sequencers go read-only after upgrade time).
• Integration test demonstrating a validator moving from Protocol Version N to N+1 without manual intervention.

_Originally posted by @pedrodneves in https://github.com/canton-foundation/canton-dev-fund/issues/76#issuecomment-4306167448_