refactor: Align vocabulary — component → program / deployment

Canonical terms (see docs/registry.md glossary):
- program: any catalog entry (tool/daemon/frontend) — the software
- service / job: how a program is deployed (systemd .service / .timer)
- deployment: umbrella for the unified service+job+program view

Changes:
- core: ServiceSpec/JobSpec component: → program: (component accepted as
  back-compat validation_alias); DeployedComponent → Deployment.
- api: ComponentSummary/Detail → DeploymentSummary/Detail; GET /components
  → /deployments; GatewayRoute.component → program; GatewayInfo
  .component_count → deployment_count; ServiceActionResponse/action keys
  component → program.
- app: matching type renames, /components → /deployments hook, route
  /component/:name → /deployment/:name, GatewayRoute.program.
- docs: component-registry.md → registry.md (+ canonical glossary);
  CLAUDE.md endpoint list refreshed (drop removed /tools, add typed
  program/service/job + config routes).

Tests: core 92, cli 24, api 52 green; app build clean; ruff clean.

castle-api/tests/test_mqtt.py

@@ -2,7 +2,7 @@
 
 import json
 
-from castle_core.registry import DeployedComponent, NodeConfig, NodeRegistry
+from castle_core.registry import Deployment, NodeConfig, NodeRegistry
 
 from castle_api.mqtt_client import _json_to_registry, _registry_to_json
 
@@ -11,7 +11,7 @@ def _make_registry() -> NodeRegistry:
     return NodeRegistry(
         node=NodeConfig(hostname="tower", castle_root="/data/repos/castle", gateway_port=9000),
         deployed={
-            "my-svc": DeployedComponent(
+            "my-svc": Deployment(
                 runner="python",
                 run_cmd=["uv", "run", "my-svc"],
                 env={"PORT": "9001", "SECRET_KEY": "super-secret"},
@@ -23,7 +23,7 @@ def _make_registry() -> NodeRegistry:
                 proxy_path="/my-svc",
                 managed=True,
             ),
-            "my-job": DeployedComponent(
+            "my-job": Deployment(
                 runner="command",
                 run_cmd=["my-job"],
                 behavior="tool",
@@ -75,7 +75,7 @@ class TestRegistrySerialization:
         reg = NodeRegistry(
             node=NodeConfig(hostname="minimal"),
             deployed={
-                "bare": DeployedComponent(runner="command", run_cmd=["bare"]),
+                "bare": Deployment(runner="command", run_cmd=["bare"]),
             },
         )
         restored = _json_to_registry(_registry_to_json(reg))