fix(chart): correct ha-mcp image tag from v6.7.1 to 6.7.1

The ghcr.io/homeassistant-ai/ha-mcp registry publishes tags without
the 'v' prefix, causing ErrImagePull when the sidecar is enabled.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

chart/Chart.yaml

@@ -2,5 +2,5 @@ apiVersion: v2
 name: devcontainer
 description: Antigravity Dev Container with Happy Coder AI assistant
 type: application
-version: 0.1.21
+version: 0.1.22
 appVersion: "latest"

chart/values.yaml

@@ -99,7 +99,7 @@ mcpSidecars:
     enabled: false  # Disabled by default, requires HOMEASSISTANT_URL and HOMEASSISTANT_TOKEN
     image:
       repository: ghcr.io/homeassistant-ai/ha-mcp
-      tag: v6.7.1  # Pinned version (Feb 20, 2026) - latest stable release
+      tag: 6.7.1  # Pinned version (Feb 20, 2026) - latest stable release
     port: 8087
     resources:
       requests: