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/db_module.go

@@ -1,6 +1,5 @@
 // Package sandbox — db_module.go
 //
-// v0.29.2 CS1: Structured db module for Starlark extensions.
 //
 // Permissions:
 //   db.read  → db.query(), db.view(), db.list_tables()