chore: auto-commit (286 archivos)

- .claude/agents/fn-orquestador/SKILL.md
- .claude/commands/fn_claude.md
- .claude/rules/INDEX.md
- .claude/rules/cpp_apps.md
- .claude/rules/ids_naming.md
- CHANGELOG.md
- apps/dag_engine/README.md
- apps/dag_engine/api.go
- apps/dag_engine/dags_migrated/example.yaml
- apps/dag_engine/dags_migrated/example_lineage_tracking.yaml
- ...

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/dag_engine/executor.go

@@ -156,22 +156,41 @@ func (e *Executor) ExecuteDAG(ctx context.Context, dagPath string, trigger strin
 func (e *Executor) executeStep(ctx context.Context, runID string, dag core.DagDefinition, step core.DagStep, daguEnvPath string, outputs map[string]string, mu *sync.Mutex) error {
 	stepID := generateID()
 	now := time.Now()
+
+	// Resolve command source: function (registry) takes precedence over command/script.
+	var command string
+	var stepFunctionID string
+	if step.Function != "" {
+		stepFunctionID = step.Function
+		fnBin := os.Getenv("FN_BIN")
+		if fnBin == "" {
+			root := os.Getenv("FN_REGISTRY_ROOT")
+			if root == "" {
+				root = "/home/lucas/fn_registry"
+			}
+			fnBin = root + "/fn"
+		}
+		parts := []string{fnBin, "run", step.Function}
+		parts = append(parts, step.Args...)
+		command = strings.Join(parts, " ")
+	} else if step.Command != "" {
+		command = step.Command
+	} else if step.Script != "" {
+		command = step.Script
+	}
+
 	e.store.InsertStepResult(&store.DagStepResult{
-		ID:        stepID,
-		RunID:     runID,
-		StepName:  stepName(step),
-		Status:    "running",
-		StartedAt: &now,
+		ID:         stepID,
+		RunID:      runID,
+		StepName:   stepName(step),
+		FunctionID: stepFunctionID,
+		Status:     "running",
+		StartedAt:  &now,
 	})
 
 	// Build environment.
 	env := buildStepEnv(dag, step, daguEnvPath, outputs)
 
-	// Determine command.
-	command := step.Command
-	if command == "" && step.Script != "" {
-		command = step.Script
-	}
 	if command == "" {
 		e.store.UpdateStepResult(stepID, "skipped", 0, "", "", nil, 0, "no command or script")
 		return nil