Deckard v0.4.0

First Deckard release: local AI-text marking for Chrome using a native quantized Gradient helper. Requires Apple Silicon, macOS 15+, and Chrome 121+. Includes the model, runtime licenses, and fixed-ID unpacked extension. The installer configures PATH and native messaging; Chrome Developer Mode and Load unpacked remain manual. Experimental scores, not proof of authorship. Ad-hoc signed, not notarized. See README for installation and safe uninstall instructions.