fix(release): Unignore Claude manifest files

Scope the .gitignore rule to the root Claude plugin directory so\nrelease staging can add the tracked manifest files.\n\nAlso include the upstream Trackio Claude manifest that ships inside\nthe imported skill directory.

.gitignore

@@ -9,7 +9,9 @@ __pycache__/
 antigravity-awesome-skills-*.tgz
 
 .agent/rules/
-.claude-plugin/
+/.claude-plugin/*
+!/.claude-plugin/plugin.json
+!/.claude-plugin/marketplace.json
 .codex/
 .gemini/
 .release-clone-*/

skills/hugging-face-trackio/.claude-plugin/plugin.json

@@ -0,0 +1,19 @@
+{
+  "name": "trackio-cli",
+  "version": "1.0.0",
+  "description": "Query Trackio projects, runs, and metrics using the `trackio` CLI. Use when the user needs to list projects/runs/metrics, get summaries, or retrieve metric values from local Trackio databases. Supports both human-readable and JSON output formats. Covers project discovery, run inspection, metric querying, and system metrics. Designed for LLM agents and automation scripts.",
+  "author": {
+    "name": "Hugging Face"
+  },
+  "repository": "https://github.com/huggingface/skills",
+  "license": "Apache-2.0",
+  "keywords": [
+    "trackio",
+    "experiment-tracking",
+    "metrics",
+    "mlops",
+    "cli",
+    "monitoring"
+  ]
+}
+