Add Canary Release Channel

Nucleic-Session: 90CFCF35-D244-4EF0-92E7-DD9DAE62CBDF
Co-authored-by: Nucleic <[email protected]>

scripts/release-macos.sh

@@ -4,7 +4,7 @@
 # staple the .app → build + sign the DMG → notarize + staple the DMG → (optionally)
 # regenerate the Sparkle appcast.
 #
-#   scripts/release-macos.sh {beta|rc|stable}        # dev isn't a distribution channel
+#   scripts/release-macos.sh {canary|beta|rc|stable}   # dev isn't a distribution channel
 #
 # Prerequisites (one-time — see signing/README.md):
 #   • A "Developer ID Application" certificate in the keychain (auto-detected, or set