v0.0.4: fosm-coding-agent is now a real Gemlings-powered coding agent

Gem release and name space errors

README: Link to testing guide after Installation section

Fix .mcp.json type: "sse" → "http"

Add MCP config generator; fix .mcp.json schema

Docs: Fix testing guide for known fosm-rails issues

Fix: Add Bundler auto-require shim

Instruction for Testing

fosm-rails-coding-agent v0.0.1