v0.8.5 — Dockerfile port/expose guard + MCP Registry submission

Added

• test/dockerfile.test.ts: asserts the Dockerfile's ENV PORT and EXPOSE values stay in sync — regression guard for the target-port mismatch that caused the v0.8.2 Railway 502 ("Application failed to respond").
• server.json + package.json's mcpName field: publishes bookie's metadata to the official MCP Registry (registry.modelcontextprotocol.io), so directories like PulseMCP can auto-discover it instead of requiring a separate manual submission per directory.

Docs

• docs/RELEASING.md: fixed stale drift — NEON_API_KEY was documented as "Not yet set" but has been set since 2026-07-02, before the last release even ran.