Skill Dumpster v0.1.0

Initial Skill Dumpster release.\n\nArtifacts:\n- SkillDumpster-0.1.0.dmg: drag-and-drop macOS disk image.\n- SkillDumpster-0.1.0.zip: signed app zip.\n- SHA256SUMS.txt: artifact checksums.\n\nNote: the app is Developer ID signed but not notarized yet.