fix(helm): remove unused grpc port 21212 and point NOTES.txt to MCP bridge

[ajitsahu]

Description

This PR cleans up the unused gRPC port (21212) from the Helm chart and updates NOTES.txt to point users to the active built-in MCP server (31313).

• Motivation: Following the post-install instructions in NOTES.txt caused dial tcp4 127.0.0.1:21212: connection refused because the server binary
  only runs the HTTP API server (8080 / 12121) and the MCP Bridge (31313).
• What changed:
  • charts/agentregistry/templates/NOTES.txt: Updated port-forward output to point to .Values.service.ports.mcp (31313).
  • charts/agentregistry/values.yaml: Removed unused grpc: 21212 keys from ports, targetPorts, and nodePorts.
  • charts/agentregistry/templates/service.yaml & deployment.yaml: Removed dead grpc port entries.
  • charts/agentregistry/tests/service_test.yaml: Updated Helm unit tests.
• Related issues: Fixes [Helm Chart / Docs] Port 21212 connection refused after following Helm NOTES.txt instructions #595

Change Type

/kind fix
/kind install

Changelog

fix(helm): remove unused grpc port 21212 and point NOTES.txt to MCP bridge

[inFocus7]

Looks good! Some minor nits then can aprove:

1. There's a README.md.gotmpl file that brings up the grpc endpoint (line 20?) which no longer exists
2. I think you need to run make verify to regenerate Helm docs with changes
3. The label check is failing, not sure why though 😅 (not sure if it's due to missing code block ``` string)