chore: strip pre-fork version comments across 72 files

Removes standalone "// v0.X.X:" comment lines and inline trailing
version annotations. Keeps version references in config field docs
and compatibility notes where they describe requirements.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/handlers/workflow_packages.go

@@ -1,6 +1,6 @@
 package handlers
 
-// workflow_packages.go — v0.30.2 CS1
+// workflow_packages.go
 //
 // Handles workflow-specific package operations:
 //   - ExportWorkflowPackage: bundles a workflow definition + stages into a .pkg