V42 Gate 3: Add Reading Shortest Path State Machine

Implement the source-safe Reading route state contract with recoverable transaction ids, readingStage hydration, retry/restart posture, failure repair actions, and Terminal route projection.

Add the V42 Reading shortest path artifact, generator, checker, protocol export/test, workflow wiring, and documentation/parity updates, including V43+ UX route-renaming scope for Packs, Read, and Deposit.

Author: geraldarthurdavis

.bitcode/v42-depositing-shortest-path.json

@@ -424,7 +424,7 @@
       "passed": true
     },
     {
-      "id": "roadmap-current-gate-advanced",
+      "id": "roadmap-records-gate2-closure",
       "sourcePath": "SPECIFICATIONS_ROADMAP.md",
       "passed": true
     }