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/conftest.py

@@ -10,7 +10,7 @@ from fastapi.testclient import TestClient
 import castle_api.config as api_config
 from castle_api.main import app
 from castle_core.registry import (
-    DeployedComponent,
+    Deployment,
     NodeConfig,
     NodeRegistry,
     save_registry,
@@ -50,7 +50,7 @@ def castle_root(tmp_path: Path) -> Generator[Path, None, None]:
         },
         "services": {
             "test-svc": {
-                "component": "test-svc-comp",
+                "program": "test-svc-comp",
                 "description": "Test service",
                 "run": {
                     "runner": "python",
@@ -92,7 +92,7 @@ def registry_path(tmp_path: Path, castle_root: Path) -> Generator[Path, None, No
             gateway_port=9000,
         ),
         deployed={
-            "test-svc": DeployedComponent(
+            "test-svc": Deployment(
                 runner="python",
                 run_cmd=["uv", "run", "test-svc"],
                 env={