Fix plugin manifest for Claude Code skill discovery

Replace .claude-plugin/marketplace.json with .claude-plugin/plugin.json
(the standard format Claude Code expects). Skills are auto-discovered
from the skills/ directory — no explicit listing needed in the manifest.

Author: yanpgwang

.claude-plugin/marketplace.json

@@ -0,0 +1,8 @@
+{
+  "name": "context-profiler",
+  "description": "Analyze agent traces, transcripts, Langfuse exports, and raw provider requests for context bloat, redundancy, and tool hotspots.",
+  "version": "0.2.0",
+  "author": {
+    "name": "Yanpeng Wang"
+  }
+}

.claude-plugin/plugin.json

@@ -82,6 +82,6 @@ Do not put product-distribution skills in `.agents/skills/` or `.claude/skills/`
 If skill paths change, update:
 
 - `.plugin/plugin.json`
-- `.claude-plugin/marketplace.json`
+- `.claude-plugin/plugin.json`
 - README skill distribution section
 - tests covering manifests

CLAUDE.md

@@ -487,7 +487,7 @@ def test_skill_distribution_manifests():
     root = Path(__file__).parents[1]
     skill = root / "skills" / "analyze-agent-context" / "SKILL.md"
     open_plugin = root / ".plugin" / "plugin.json"
-    claude_marketplace = root / ".claude-plugin" / "marketplace.json"
+    claude_plugin = root / ".claude-plugin" / "plugin.json"
 
     assert skill.exists()
     assert "name: analyze-agent-context" in skill.read_text()
@@ -496,9 +496,8 @@ def test_skill_distribution_manifests():
     assert plugin_data["name"] == "context-profiler"
     assert plugin_data["skills"] == ["./skills/analyze-agent-context"]
 
-    marketplace_data = json.loads(claude_marketplace.read_text())
-    assert marketplace_data["plugins"][0]["name"] == "context-profiler"
-    assert marketplace_data["plugins"][0]["skills"] == ["./skills/analyze-agent-context"]
+    claude_data = json.loads(claude_plugin.read_text())
+    assert claude_data["name"] == "context-profiler"
 
 
 def test_diagnose_agent_trace_sample_json():