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/triggers/engine.go

@@ -1,6 +1,5 @@
 // Package triggers — engine.go
 //
-// v0.2.2: Core trigger engine. Manages extension-declared triggers
 // (event bus subscriptions + webhook receivers) and user-created
 // scheduled tasks (cron). All three converge to sandbox.Runner.CallEntryPoint.
 package triggers