feat: consolidate marketplace skills into kyberforge plugin

Moves create-plugin, marketplace-architect, write-skill, and write-eval
from canonical .agents/skills/ into plugins/kyberforge/skills/, along
with all bundled sub-files, evals, and the plugin-marketplace-architecture
research doc. Bundles templates/plugin/ into create-plugin/assets/plugin-template/
so the skill is self-contained after install-time caching. Removes
templates/plugin/ and docs/research/plugin-marketplace-architecture.md
from the repo root as they are now exclusively in the plugin.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/skills/create-plugin/assets/plugin-template/hooks/README.md

@@ -0,0 +1,27 @@
+# hooks/
+
+**Claude Code only.** Hook definitions that run in response to Claude Code events.
+
+The `hooks.json` in this directory is read by Claude Code. Structure:
+
+```json
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          { "type": "command", "command": "echo 'tool used'" }
+        ]
+      }
+    ]
+  }
+}
+```
+
+Supported events: `PreToolUse`, `PostToolUse`, `Notification`, `Stop`.
+
+Use `${CLAUDE_PLUGIN_ROOT}` to reference scripts inside this plugin — the plugin runs
+from a cache path after install, not its original repo location.
+
+For GitHub Copilot CLI hooks, see `hooks.json` at the plugin root.