claude-plugins: ship a hyperhive-authored notes-hygiene skill by default

nix/packages/claude-plugins.nix

@@ -0,0 +1,48 @@
+{
+  stdenv,
+}:
+
+# hyperhive-authored Claude Code plugin marketplace (source tree at
+# ../../claude-plugins), shipped as a standalone derivation and spliced
+# into the *default* `hyperhive.claudeMarketplaces`/`claudePlugins` lists
+# (nix/agent-modules/claude-settings.nix) as a local marketplace source.
+# `claude plugin marketplace add` accepts a plain filesystem path (verified:
+# `claude plugin marketplace add --help` → "Add a marketplace from a URL,
+# path, or GitHub repo"), and registers it under the marketplace.json's own
+# `name` field ("hyperhive") rather than the path — so
+# `<plugin>@hyperhive` is a stable plugin spec regardless of the store
+# path's hash. The built store path IS the marketplace: no forge repo, no
+# git remote, no PAT/PR ceremony needed to ship a skill hive-wide.
+#
+# Every hive-authored skill lives under its own `plugins/<name>/` subtree
+# in the source tree; add one there plus a matching entry in
+# `.claude-plugin/marketplace.json`'s `plugins` list to ship another.
+#
+# Pure data: nothing to build, `$out` is the tree as-is (mirrors
+# ./reference-docs.nix). `cp -r . "$out"` (not `cp -r ./* $out`) because
+# the marketplace/plugin manifests live under `.claude-plugin/` — a
+# hidden directory a shell glob (`*`) would silently skip.
+stdenv.mkDerivation {
+  pname = "hyperhive-claude-plugins";
+  version = "0.1.0";
+  # Narrow src keeps this derivation's input hash decoupled from the rest
+  # of the tree — a skill edit only re-hashes this.
+  src = ../../claude-plugins;
+
+  dontBuild = true;
+  dontConfigure = true;
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out
+    cp -r . "$out"/
+    runHook postInstall
+  '';
+
+  dontFixup = true;
+
+  meta = {
+    description = "hyperhive-authored Claude Code plugin marketplace (skills shipped hive-wide)";
+    homepage = "https://forge.darkest.space/hyperhive/hyperhive";
+  };
+}

nix/packages/default.nix

@@ -139,6 +139,11 @@ in
   # so the binary derivation stays cached when a prompt edit ripples
   # through.
   assets = pkgs.callPackage ./assets.nix { };
+  # hyperhive-authored Claude Code plugin marketplace (source tree at
+  # ../../claude-plugins) — a local-path marketplace spliced into the
+  # default `hyperhive.claudeMarketplaces`/`claudePlugins` lists. See
+  # ./claude-plugins.nix for the "why a store path, not a repo" rationale.
+  claude-plugins = pkgs.callPackage ./claude-plugins.nix { };
   # The repo docs/ markdown tree as a standalone derivation —
   # agents read it in-container (added as a claude additional
   # directory) and the website repo reuses it as a flake input,