feat: add dynamic molecule bonding with --ref flag (bd-xo1o.1)

Implements the Christmas Ornament pattern for patrol molecules:
- Add CloneOptions struct with ParentID and ChildRef for dynamic bonding
- Add generateBondedID() to create custom IDs like "patrol-x7k.arm-ace"
- Add --ref flag to `bd mol bond` for custom child references
- Variable substitution in childRef (e.g., "arm-{{polecat_name}}")

This enables:
  bd mol bond mol-polecat-arm bd-patrol --ref arm-{{name}} --var name=ace
  # Creates: bd-patrol.arm-ace, bd-patrol.arm-ace.capture, etc.

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

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

cmd/bd/pour.go

@@ -200,7 +200,7 @@ func runPour(cmd *cobra.Command, args []string) {
 		}
 
 		for _, attach := range attachments {
-			bondResult, err := bondProtoMol(ctx, store, attach.issue, spawnedMol, attachType, vars, actor)
+			bondResult, err := bondProtoMol(ctx, store, attach.issue, spawnedMol, attachType, vars, "", actor)
 			if err != nil {
 				fmt.Fprintf(os.Stderr, "Error attaching %s: %v\n", attach.id, err)
 				os.Exit(1)