Derive program behavior from deployments; stop persisting it

behavior (tool/daemon/frontend) is now a derived display label computed
from a program's deployments — path->tool, static->frontend, process->daemon
(behavior_for_runner). load_config populates it so every reader gets the live
value; _spec_to_yaml_dict excludes it so it is never written to disk.
_summary_from_service derives it from the runner instead of hardcoding daemon.
Fixtures gain path/python deployments so tool/daemon behaviors derive.

core/src/castle_core/deploy.py

@@ -41,7 +41,7 @@ from castle_core.generators.systemd import (
     unit_env_file,
     unit_name,
 )
-from castle_core.manifest import JobSpec, ServiceSpec, manager_for
+from castle_core.manifest import JobSpec, ServiceSpec, behavior_for_runner, manager_for
 from castle_core.registry import (
     REGISTRY_PATH,
     Deployment,
@@ -401,7 +401,7 @@ def _build_deployed_service(
         env=env,
         secret_env_keys=sorted(secret_env),
         description=_resolve_description(config, svc),
-        behavior="daemon",
+        behavior=behavior_for_runner(run.runner),
         stack=stack,
         port=port,
         health_path=health_path,