refactor(recipe): enhance shell command security with global safe list

- Introduce global safeCommands() map for command whitelisting.
- Implement case-insensitive prefix checking for allowed commands.
- Simplify argument handling by removing redundant int conversions.
- Update error messages and comments for clarity on security policies.
- Remove outdated comments and adjust prompt text for consistency.

internal/recipe/runner.go

@@ -258,7 +258,7 @@ func createUnifiedPatch(changes []FileChange, patchPath string) error {
 	return nil
 }
 
-// executeReadOnlyShell — now handles numbers in args (like tree -L 3)
+// executeReadOnlyShell — safe, whitelisted, read-only shell execution with user confirmation
 func (r *Runner) executeReadOnlyShell(step Step, previousResults []string) {
 	prompt := fmt.Sprintf(`You need additional context from the filesystem for this step.
 
@@ -285,7 +285,7 @@ Return ONLY a JSON array of read-only commands. Example:
   }
 ]
 
-Only use safe read-only commands from the allowed list.`,
+Only use safe read-only commands.`,
 		r.Recipe.Overview,
 		strings.Join(previousResults, "\n\n---\n\n"),
 		step.Objective,
@@ -312,7 +312,7 @@ Only use safe read-only commands from the allowed list.`,
 
 	type ShellCommand struct {
 		Command string        `json:"command"`
-		Args    []interface{} `json:"args"` // allows strings and numbers
+		Args    []interface{} `json:"args"`
 	}
 
 	var cmds []ShellCommand
@@ -321,6 +321,9 @@ Only use safe read-only commands from the allowed list.`,
 		return
 	}
 
+	// Use the GLOBAL safe list for the security check
+	safeMap := safeCommands()
+
 	for _, cmd := range cmds {
 		// Build argument list, converting numbers to strings
 		args := make([]string, len(cmd.Args))
@@ -330,8 +333,6 @@ Only use safe read-only commands from the allowed list.`,
 				args[i] = v
 			case float64:
 				args[i] = strconv.FormatFloat(v, 'f', -1, 64)
-			case int, int64:
-				args[i] = fmt.Sprintf("%v", v)
 			default:
 				args[i] = fmt.Sprintf("%v", v)
 			}
@@ -354,16 +355,18 @@ Only use safe read-only commands from the allowed list.`,
 			continue
 		}
 
-		// Whitelist check
+		// FINAL SECURITY CHECK — use the global safe list
 		allowed := false
-		for _, allowedCmd := range r.Recipe.AllowedShellCommands {
-			if strings.HasPrefix(cmd.Command, allowedCmd) {
+		trimmedCmd := strings.ToLower(strings.TrimSpace(cmd.Command))
+		for safe := range safeMap {
+			if strings.HasPrefix(trimmedCmd, strings.ToLower(safe)) {
 				allowed = true
 				break
 			}
 		}
+
 		if !allowed {
-			fmt.Printf("   ❌ Command not allowed: %s\n", cmd.Command)
+			fmt.Printf("   ❌ Command not allowed by global safety policy: %s\n", cmd.Command)
 			continue
 		}