feat(kyberforge): add apm-install skill

Wraps apm CLI binary install and agent-runtime setup
(apm runtime setup/list/status/remove), the bootstrap step
ahead of apm-workflow's configure/compile/audit loop.

plugins/kyberforge/skills/apm-install/README.md

@@ -0,0 +1,22 @@
+# apm-install
+
+Installs and configures the `apm` (Agent Package Manager) CLI and the agent runtimes it manages.
+
+## What it does
+
+Covers the two provisioning steps for working with apm: installing the `apm` binary itself (quick-install script, pinned version, air-gapped mirror, or pip), and installing/managing an agent runtime apm drives (`apm runtime setup copilot|codex|gemini|llm`, listing installed runtimes, checking which one `apm run` defaults to).
+
+## Usage
+
+```
+/apm-install
+```
+
+Once `apm` and a runtime are in place, use `apm-workflow` for authoring `apm.yml`, scaffolding packages/marketplaces, compiling, packing, publishing, and auditing.
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `SKILL.md` | Skill instructions for agents |
+| `references/sources.md` | Provenance chain — research sources that informed this skill |