Rename project to GoSentry

Rename the application, Go module path, command package, build artifacts, resource script, and embedded icon assets from PySentry/pysentry to GoSentry/gosentry.

Move portable settings to gosentry.yaml while reading legacy pysentry.yaml during the transition, then rewrite settings under the new name.

Update Windows and Linux autostart integration to use GoSentry names while cleaning up legacy PySentry registry, desktop-entry, and systemd artifacts.

Refresh README, architecture notes, roadmap, changelog, and release examples for version 0.3.0.

src/core/desktop_linux.go

@@ -18,7 +18,7 @@ func InstallDesktopIntegration(appID string, executablePath string, icon []byte)
 	// environment can match the window app id to an installed .desktop file and
 	// icon. Use the user's XDG data directory so portable builds do not need root
 	// access or a package manager install step.
-	iconPath := filepath.Join(dataHome, "icons", "hicolor", "256x256", "apps", "pysentry.png")
+	iconPath := filepath.Join(dataHome, "icons", "hicolor", "256x256", "apps", "gosentry.png")
 	if err := writeUserFile(iconPath, icon, 0o644); err != nil {
 		return "", err
 	}
@@ -26,8 +26,8 @@ func InstallDesktopIntegration(appID string, executablePath string, icon []byte)
 	desktopPath := filepath.Join(dataHome, "applications", appID+".desktop")
 	desktopFile := fmt.Sprintf(`[Desktop Entry]
 Type=Application
-Name=PySentry
-Comment=PySentry desktop scheduler
+Name=GoSentry
+Comment=GoSentry desktop scheduler
 Exec=%s
 Icon=%s
 Terminal=false