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/sandbox/modules.go

@@ -1,6 +1,5 @@
 // Package sandbox — modules.go
 //
-// v0.29.0 CS3: Module factories for Starlark sandbox.
 // Each factory returns a starlarkstruct.Module that the runner
 // injects into the script namespace based on granted permissions.
 package sandbox