feat: add MCP healthcheck probes and new templates (grafana, home-assistant, node-red)

- Add healthCheck spec to templates and servers (tool, arguments, interval, timeout, failureThreshold)
- Add healthStatus, lastHealthCheck, events fields to instances
- Create grafana, home-assistant, node-red templates with healthcheck probes
- Add healthcheck probes to existing templates (github, slack, postgres, jira)
- Show HEALTH column in `get instances` and Events section in `describe instance`
- Display healthCheck details in `describe server` and `describe template`
- Schema + storage + display only; actual probe runner is future work

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/github.yaml

@@ -4,6 +4,10 @@ description: GitHub MCP server for repos, issues, PRs, and code search
 packageName: "@anthropic/github-mcp"
 transport: STDIO
 repositoryUrl: https://github.com/modelcontextprotocol/servers/tree/main/src/github
+healthCheck:
+  tool: search_repositories
+  arguments:
+    query: "test"
 env:
   - name: GITHUB_TOKEN
     description: Personal access token with repo scope

templates/grafana.yaml

@@ -0,0 +1,16 @@
+name: grafana
+version: "1.0.0"
+description: Grafana MCP server for dashboards, datasources, and alerts
+packageName: "@leval/mcp-grafana"
+transport: STDIO
+repositoryUrl: https://github.com/levalhq/mcp-grafana
+healthCheck:
+  tool: list_datasources
+  arguments: {}
+env:
+  - name: GRAFANA_URL
+    description: Grafana instance URL (e.g. https://grafana.example.com)
+    required: true
+  - name: GRAFANA_SERVICE_ACCOUNT_TOKEN
+    description: Grafana service account token (glsa_...)
+    required: true

templates/home-assistant.yaml

@@ -0,0 +1,16 @@
+name: home-assistant
+version: "1.0.0"
+description: Home Assistant MCP server for smart home control and entity management
+packageName: "home-assistant-mcp-server"
+transport: STDIO
+repositoryUrl: https://github.com/tevonsb/homeassistant-mcp
+healthCheck:
+  tool: get_entities
+  arguments: {}
+env:
+  - name: HASS_URL
+    description: Home Assistant instance URL (e.g. http://homeassistant.local:8123)
+    required: true
+  - name: HASS_TOKEN
+    description: Home Assistant long-lived access token
+    required: true

templates/jira.yaml

@@ -4,6 +4,11 @@ description: Jira MCP server for issues, projects, and boards
 packageName: "@anthropic/jira-mcp"
 transport: STDIO
 repositoryUrl: https://github.com/modelcontextprotocol/servers/tree/main/src/jira
+healthCheck:
+  tool: search_issues
+  arguments:
+    jql: "created >= -1d"
+    maxResults: 1
 env:
   - name: JIRA_URL
     description: Jira instance URL (e.g. https://company.atlassian.net)

templates/node-red.yaml

@@ -0,0 +1,16 @@
+name: node-red
+version: "1.0.0"
+description: Node-RED MCP server for flow management and automation
+packageName: "mcp-node-red"
+transport: STDIO
+repositoryUrl: https://github.com/fx/mcp-node-red
+healthCheck:
+  tool: get_settings
+  arguments: {}
+env:
+  - name: NODE_RED_URL
+    description: Node-RED instance URL (e.g. http://nodered.local:1880)
+    required: true
+  - name: NODE_RED_TOKEN
+    description: Node-RED access token (optional if no auth)
+    required: false

templates/postgres.yaml

@@ -4,6 +4,10 @@ description: PostgreSQL MCP server for database queries and schema inspection
 packageName: "@anthropic/postgres-mcp"
 transport: STDIO
 repositoryUrl: https://github.com/modelcontextprotocol/servers/tree/main/src/postgres
+healthCheck:
+  tool: query
+  arguments:
+    sql: "SELECT 1"
 env:
   - name: POSTGRES_CONNECTION_STRING
     description: PostgreSQL connection string (e.g. postgresql://user:pass@host:5432/db)

templates/slack.yaml

@@ -4,6 +4,9 @@ description: Slack MCP server for reading channels, messages, and user info
 packageName: "@anthropic/slack-mcp"
 transport: STDIO
 repositoryUrl: https://github.com/modelcontextprotocol/servers/tree/main/src/slack
+healthCheck:
+  tool: list_channels
+  arguments: {}
 env:
   - name: SLACK_BOT_TOKEN
     description: Slack bot token (xoxb-...)