v0.1.13 — fips v0.1.2, h2spec conformance

- fips v0.1.2 (2026-10-11 release chain: converge the devnw Zig graph on
  fips v0.1.2 and thread-pool v0.2.8), zlib 1.3.2.
- Server enforces HTTP/2 framing, stream-state and request rules (h2spec
  generic http2 138/138); ClientMux serialises stream opening (RFC 7540
  5.1.1).
- Interop fixes (Echo path routing, handshake no longer waits for a
  connection WINDOW_UPDATE); CI creates GitLab Releases with the job token.