net/http gets a MethodQuery constant for RFC 10008

The accepted proposal to add a MethodQuery constant to net/http leads the day, giving the RFC 10008 HTTP QUERY method (safe, idempotent, with a request body) a first-class name in the standard library. On the reading pile, a walkthrough of sync.Map's move to a hash trie builds the implementation up from a plain map and covers lock-free reads, writer locking, and Range, which pairs nicely with a quieter afternoon and a coffee. Elsewhere, three separate advisories against mcp-shell land together, all variations on bypassing its secure-mode allowlist, so anyone running it will want to look.