fix: bd edit now parses EDITOR with args (GH#987)

Parse $EDITOR value to handle editors that need flags like
"zeditor --wait" or "code --wait". Previously the entire string
was treated as the executable name.

Fixes #987

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

Executed-By: beads/crew/dave
Rig: beads
Role: crew

cmd/bd/edit.go

@@ -130,8 +130,10 @@ Examples:
 		}
 		_ = tmpFile.Close()
 
-		// Open the editor
-		editorCmd := exec.Command(editor, tmpPath) //nolint:gosec // G204: editor from trusted $EDITOR/$VISUAL env or known defaults
+		// Open the editor - parse command and args (handles "vim -w" or "zeditor --wait")
+		editorParts := strings.Fields(editor)
+		editorArgs := append(editorParts[1:], tmpPath)
+		editorCmd := exec.Command(editorParts[0], editorArgs...) //nolint:gosec // G204: editor from trusted $EDITOR/$VISUAL env or known defaults
 		editorCmd.Stdin = os.Stdin
 		editorCmd.Stdout = os.Stdout
 		editorCmd.Stderr = os.Stderr