v0.7.2.1 — mmpOS packaging fixes (binaries identical to 0.7.2)

Fixes the mmpOS custom-miner experience reported after v0.7.2. The miner binaries are unchanged
(UA stays 0.7.2 — includes the pre-AVX SIGILL fix); this is a packaging-only respin.

Fixed

• mmp-launch.sh now discards the mmpOS --coin argument. Current mmpOS profiles pass
  --coin <COIN>; the old launcher forwarded it to the keryx CLI, which rejected it and exited —
  the miner never started under mmpOS.
• mmp-launcher.sh compatibility alias added (execs mmp-launch.sh) for setups that look for
  that filename, plus mmp-release-notes.txt per the official package convention.
• Every tarball flavor is now mmpOS-ready: the mmp-external.conf / mmp-launch.sh /
  mmp-launcher.sh / mmp-stats.sh files are bundled in the HiveOS, SMOS, and plain-Linux
  tarballs too — pointing the mmpOS agent at any of the assets now works. (The 0.7.2 mmpos_
  tarballs did contain the scripts; reports of "missing mmp-stats.sh" came from using the other
  flavors and from the --coin launch failure.)

Validated

Full mmpOS agent flow tested live: mmp-launcher.sh --coin KERYX --pool krx.suprnova.cc:4404 --user <wallet>.<rig> --password x --api-port 4067 → miner starts, llama engine active,
mmp-stats.sh returns the mmpOS JSON (busid/hash/units/miner_version).

Notes

• Windows/macOS unaffected. AMD packages: same fixes are in the repo for the next AMD rebuild.
• All packages still ship the v0.7.2 pre-AVX-CPU fix (libkeryx-llama-noavx.so + preflight).