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/openapi.go

@@ -1,6 +1,5 @@
 // Package handlers — openapi.go
 //
-// v0.6.2: Dynamic OpenAPI spec generation. Merges the static kernel spec
 // with extension-declared API routes. Extensions with api_schema get rich
 // path items; others get auto-generated stubs.
 //