Add slap-notes-bin

Local-first block notes with a wiki-link graph and a built-in AI research agent. Electron over a Next.js server, x86_64 only, repackaged from the vendor tarball with a Wayland launcher.

Not in the AUR. The package follows its GitHub release feed through the declarative github upstream provider, reading each release's SHA256SUMS, with a 24h min_release_age quarantine.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

pkgbuilds/slap-notes-bin/slap-notes-bin.install

@@ -0,0 +1,3 @@
+post_install() {
+  echo "Extra Chromium flags go in ~/.config/slap-notes-flags.conf, one per line."
+}