feat: workflow trace via OTel spans + analyzer

cli/pyproject.toml

@@ -11,6 +11,7 @@ requires-python = ">=3.12"
 dependencies = [
     "typer>=0.12.5",
     "pyyaml>=6.0.2",
+    "rich>=14.2.0",
     "websockets>=15.0",
     "flowmesh-sdk>=0.1.0",
 ]

cli/src/flowmesh_cli/commands/__init__.py

@@ -8,6 +8,7 @@
 from .ssh import app as ssh_app
 from .system import app as system_app
 from .task import app as task_app
+from .trace import app as trace_app
 from .worker import app as worker_app
 from .workflow import app as workflow_app
 
@@ -22,3 +23,4 @@ def register(app: typer.Typer) -> None:
     app.add_typer(node_app, name="node")
     app.add_typer(worker_app, name="worker")
     app.add_typer(ssh_app, name="ssh")
+    app.add_typer(trace_app, name="trace")