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.

cli/src/castle_cli/commands/info.py

@@ -66,10 +66,10 @@ def run_info(args: argparse.Namespace) -> int:
     stack = None
     if program and program.stack:
         stack = program.stack
-    elif service and service.component and service.component in config.programs:
-        stack = config.programs[service.component].stack
-    elif job and job.component and job.component in config.programs:
-        stack = config.programs[job.component].stack
+    elif service and service.program and service.program in config.programs:
+        stack = config.programs[service.program].stack
+    elif job and job.program and job.program in config.programs:
+        stack = config.programs[job.program].stack
     if stack:
         print(f"  {BOLD}stack{RESET}:       {stack}")
 
@@ -88,12 +88,12 @@ def run_info(args: argparse.Namespace) -> int:
     spec = service or job
     if spec:
         desc = spec.description
-        if not desc and spec.component and spec.component in config.programs:
-            desc = config.programs[spec.component].description
+        if not desc and spec.program and spec.program in config.programs:
+            desc = config.programs[spec.program].description
         if desc and not (program and program.description == desc):
             print(f"  {BOLD}description{RESET}: {desc}")
-        if spec.component:
-            print(f"  {BOLD}program{RESET}:     {spec.component}")
+        if spec.program:
+            print(f"  {BOLD}program{RESET}:     {spec.program}")
 
         # Run spec
         print(f"  {BOLD}runner{RESET}:      {spec.run.runner}")
@@ -149,8 +149,8 @@ def run_info(args: argparse.Namespace) -> int:
     source_dir = None
     if program and program.source_dir:
         source_dir = program.source_dir
-    elif spec and spec.component and spec.component in config.programs:
-        source_dir = config.programs[spec.component].source_dir
+    elif spec and spec.program and spec.program in config.programs:
+        source_dir = config.programs[spec.program].source_dir
 
     if source_dir:
         claude_md = _find_claude_md(config.root, source_dir)
@@ -191,10 +191,10 @@ def _info_json(
     stack = None
     if program and program.stack:
         stack = program.stack
-    elif service and service.component and service.component in config.programs:
-        stack = config.programs[service.component].stack
-    elif job and job.component and job.component in config.programs:
-        stack = config.programs[job.component].stack
+    elif service and service.program and service.program in config.programs:
+        stack = config.programs[service.program].stack
+    elif job and job.program and job.program in config.programs:
+        stack = config.programs[job.program].stack
     if stack:
         data["stack"] = stack