feat: add control board replacement workflow

docs/ROADMAP.md

@@ -99,11 +99,12 @@ durable asset record. Repairs, maintenance, work orders, parts usage, equipment
 movement, testing, and return-to-service history become coherent operational
 records rather than disconnected actions.
 
-The Begin Repair, read-only Repair Timeline, and Return to Service workflows are
-complete. An authorized actor can open a repair against a durable miner UUID,
-record sequenced events, and move the miner into or out of repair atomically.
-Authorized readers can inspect the repair and its ordered immutable events.
-Later repair lifecycle workflows remain planned.
+The Begin Repair, read-only Repair Timeline, Return to Service, and Control Board
+Replacement workflows are complete. An authorized actor can open a repair
+against a durable miner UUID, record sequenced events, move the miner into or out
+of repair atomically, and replace a control board without changing the durable
+asset identity. Authorized readers can inspect the repair and its ordered
+immutable events. Later repair lifecycle workflows remain planned.
 
 Technician experience is a priority. Responsive and QR-assisted workflows may
 reduce lookup and data-entry effort where they reinforce the same asset record.