feat: add repair timeline read APIs

docs/ROADMAP.md

@@ -99,9 +99,11 @@ 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 workflow is complete. An authorized actor can open a repair
-against a durable miner UUID, record sequenced starting events, and move the
-miner into repair atomically. Later repair lifecycle workflows remain planned.
+The Begin Repair and read-only Repair Timeline workflows are complete. An
+authorized actor can open a repair against a durable miner UUID, record
+sequenced starting events, and move the miner into repair atomically. 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.
@@ -214,6 +216,7 @@ Major completed foundations include:
 - Manual Inventory schema and backend domain foundation
 - Focused Inventory and migration test foundations
 - Begin Repair operational workflow
+- Read-only Repair Timeline API
 - MinerOps branding package and project README
 - Architecture guide
 - Product guide