Create fretty.json

[3dthc]

What and why

Checks

• Offline first: tools/test_port.sh <vst.json> (x86, ASan) and/or python3 tools/test_catalog.py; skin changes previewed offline
• Device-verified, or marked "offline only" here and in NOTES (device, MPC OS version, date)
• Catalog-conformant if it is a port or release (catalog_check.py --catalog OK)
• New or changed catalog entry or skin: no manufacturer names or logos in the skin art, screenshot or plugin name (descriptive "X-style" in summary/tags is fine)
• New catalog entry: it starts as Listed (or Experimental if untested bulk work); add a tested.json entry in the plugin repo, with device and MPC OS version, to be Verified
• Docs synced (map in .claude/skills/mpc-vst-plugin/SKILL.md, "Docs sync"): NOTES / PORTING / RELEASING / README / ROADMAP / SKILL / docstrings, or "no docs needed: "
• Repo stays device-generic (no IPs, serials, Akai stock skin files or Steinberg SDK)

[sd88me]

Entry is in the right place (catalog/plugins/fretty.json) and looks valid. Note a Fretty entry was also mentioned in #447 (added in the wrong folder). #457 and #460 are identical; please close one and the other can go in.

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