MXD v0.2.8

Added

• letsgo-wsl.bat — one-click Windows launcher that auto-installs
  WSL2 + Ubuntu-22.04 if missing (first run requires admin + reboot),
  then clones the repo inside WSL and runs ./letsgo testnet|mainnet.
  On a machine that already has WSL2, total bring-up is ~30 seconds —
  same as the native Linux path.
• README "Running on Windows" section — documents the WSL2 and
  MSYS2 paths side-by-side with a clear recommendation (WSL2 for
  almost everyone, MSYS2 only if WSL is unavailable).

Fixed (CI)

• integration-test job finally green. Three compounding bugs
  found and fixed via the v0.2.5 → v0.2.7 release smoke arc:

  1. The job rebuilt the full Dockerfile from scratch on every run
     (~5+ min) because docker-build's mxdlib:latest image lived on
     a different runner. Now docker-build saves the image as a
     workflow artifact and integration-test downloads + docker loads
     it (~30 s instead of ~5 min).
  2. The container CMD didn't pass --http-api 8080, so
     http.require_auth=1 + empty api_token caused the HTTP API to
     refuse to start. The compose now overrides the CMD to enable HTTP
     API explicitly (same as what letsgo does on testnet).
  3. Host curl to localhost:8080/status failed with CURLE_RECV_ERROR
     (exit 56) due to an IPv6/IPv4 bridge quirk on GitHub Actions
     runners. The verify step now uses docker exec to query
     /status from inside each container — same path as the
     healthcheck, no bridge involved.

• New docker-compose.ci.yml (mxdlib-private, not shipped via the
  public manifest). Minimal 2-node compose using image: mxdlib:latest
  with no build: directive, no monitoring stack, tight healthchecks
  asserting /status returns JSON with a "height" field. Operator-
  facing docker-compose.test.yml remains in the public repo for
  local "spin up the full stack with monitoring" use cases.

Notes

• No functional changes to libmxd, chain consensus, or wire format.
  Same binary as v0.2.7.
• The Windows launcher works against this release tag and any
  future tag — letsgo-wsl.bat itself doesn't hard-code a version;
  it delegates to the Linux letsgo script which resolves the
  latest release dynamically.

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