Correct README claims that do not match the repo

The License section named MIT. LICENSE is a transition file: new code
contributions are Apache-2.0, documentation excluding specifications is
CC-BY-4.0, and only earlier contributions without relicensing consent
stay MIT.

"Rust (stable)" understates the floor. rmcp, darling and time declare
rust-version 1.88, and cargo metadata resolves both crates to 1.88.

The Ruby aside said 3.3 also satisfies the gems. anthropic requires
>= 3.2.0 and mcp >= 2.7.0, so the gem floor was 3.2, and 3.2 reached EOL
on 2026-03-31. CI runs 3.4, which is what the READMEs now state.

The Go and Rust clients take a command plus arguments, not a path to a
server script.

Removed the commit-message convention, which is attributed to the MCP
contributing guidelines but does not appear in them. Added the
AI_POLICY.md link that CONTRIBUTING.md points to.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GdvHa5MzDw33PEz3DbTaJD

mcp-client-ruby/README.md

@@ -6,7 +6,7 @@ This example accompanies the [Build an MCP client](https://modelcontextprotocol.
 
 ## Prerequisites
 
-- Ruby 3.4+ (3.3 also satisfies the gems)
+- Ruby 3.4+
 - Bundler
 - An [Anthropic API key](https://console.anthropic.com/) (optional — see below)