feat(herdr-skills): package herdr's agent skill as a skill bundle

packages/herdr-skills/data.json

@@ -0,0 +1,12 @@
+{
+  "_meta": {
+    "default": "0.9.0",
+    "releases": "https://github.com/herdrdev/herdr/releases"
+  },
+  "0.9.0": {
+    "owner": "herdrdev",
+    "repo": "herdr",
+    "rev": "b99002ac99b09e00b4ca692436cb15a6b0d676f1",
+    "sha256": "sha256-SUYF4bbaYwNgoe498VoCUzuLPcjBLQXR0o0DWjjoSnI="
+  }
+}

packages/herdr-skills/default.nix

@@ -0,0 +1,17 @@
+{ pkgs, lib, toolbox, toolboxLib }:
+
+# Herdr's agent skill (`skills/herdr/`), packaged as a Claude Code plugin
+# directory. It teaches an agent to drive Herdr from inside a Herdr-managed
+# pane — inspecting workspaces, tabs, panes and neighbouring agents, and
+# splitting panes without stealing focus. See https://herdr.dev/docs/agent-skill/
+#
+# Upstream ships no `.claude-plugin/plugin.json`, so `fromClaudePlugin` stays
+# false: the builder discovers `skills/*/SKILL.md` and synthesizes the manifest.
+#
+# The pin is a commit, not a tag: the skill is a file in the herdr repo, so it
+# moves independently of herdr's own release cadence.
+toolboxLib.buildSkillBundle {
+  inherit pkgs;
+  name = "herdr-skills";
+  dataPath = ./data.json;
+}