docs: clean up repo cruft and update all documentation for v0.2.4

- Remove PROMPT.md (AI scaffolding artifact)
- Add .claude/settings* to .gitignore
- Commit .mcp.json (MCP server config)
- Fix ArtifactHub URLs (headlamp/tns-csi path)
- Fix tarball name (tns-csi-VERSION.tar.gz) in all install docs
- Update version URLs from v0.1.0/v0.2.0 to v0.2.4
- Update test count from 67 to 159 across 12 files
- Update Node.js version from 20 to 22
- Add CHANGELOG entry for v0.2.4
- Update testing.md with full test file inventory and CI description

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

.mcp.json

@@ -0,0 +1,24 @@
+{
+  "mcpServers": {
+    "github": {
+      "type": "http",
+      "url": "https://api.githubcopilot.com/mcp/",
+      "headers": {
+        "Authorization": "Bearer ${GITHUB_TOKEN}"
+      }
+    },
+    "kubernetes": {
+      "type": "sse",
+      "url": "http://localhost:8080/sse"
+    },
+    "flux": {
+      "type": "sse",
+      "url": "http://localhost:8081/sse"
+    },
+    "playwright": {
+      "type": "sse",
+      "url": "http://localhost:8086/sse"
+    }
+  }
+}
+