Remove bd mol run - orchestration belongs in gt

bd mol run was a convenience combo (pour + assign + pin + start) that
felt like orchestration but lived in the data layer. This blurred the
architectural boundary between bd (data) and gt (orchestration).

- Delete cmd/bd/mol_run.go entirely
- Update mol.go help text to remove run reference
- Update mol_current.go to suggest bd pour instead

gt spawn will implement the orchestration combo by calling the atomic
bd commands (pour, update, pin) directly.

Closes bd-00u3

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/mol.go

@@ -51,7 +51,6 @@ Commands:
   catalog  List available protos
   show     Show proto/molecule structure and variables
   bond     Polymorphic combine: proto+proto, proto+mol, mol+mol
-  run      Pour + assign + pin for durable execution
   distill  Extract proto from ad-hoc epic
 
 See also: