Release v0.5.0 · xyzzylabs/tc39-mcp

Adds the MCP prompts capability and moves the hosted deployment to its
own domain.

MCP prompts (workflow templates). Seven reusable prompts —
explain-clause, compare-editions, find-and-read,
trace-crossrefs, proposal-status, test262-for-feature,
cite-reproducibly — that steer an agent through the right tool
sequence. Pure string templates (no execution); advertised on both the
stdio server and the hosted Worker via prompts/list + prompts/get.

Hosted deployment moved to mcp.xyzzylabs.ai/tc39. The docs site,
the registry MCP endpoint, and the npm package's R2-fetch origin point
there now. The old *.workers.dev URL still serves identical data.
Edition aliases normalize. ES2025, 2025, es-2025, Latest,
MAIN resolve to canonical editions instead of 404-ing on a missing
snapshot key — the same tolerance the ecma262 / ecma402 spec
aliases got in 0.4.1. A well-formed but out-of-range edition (es2015)
still reports "unsupported".
Discoverability: step-text + test262 linkage. The server
instructions now point agents at spec.search { search_steps: true }
for "where is X invoked" queries and at test262.search { esid } for a
clause's conformance tests (a clause id is its esid), and drop the
hard-coded tool list — the live set comes from tools/list.

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