feat(skills): add neuledge-context skill for @neuledge/context MCP server

Adds a complete cross-cutting skill to install, configure, and manage
@neuledge/context — a local-first MCP server that delivers version-specific
library docs to AI agents via SQLite FTS5.

Includes:
- SKILL.md with 9-step process: install, global MCP registration, per-project
  --libs scoping, package management, auth, custom registry, upgrade, uninstall
- setup-neuledge-context.sh: pinned version install, idempotent version check
- secure-context-config.sh: chmod 600 on ~/.context/config.json after auth
- 13-case test suite covering both scripts (all pass)
- eval.yaml with 6 trigger tests and 4 output tests
- references/: context-cli-reference.md, http-mode.md, install-notes.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TP4EGbBg3XMcyF28Lx78XJ

.agents/skills/neuledge-context/references/http-mode.md

@@ -0,0 +1,53 @@
+# HTTP / Docker Mode
+
+`context serve` can run as an HTTP MCP server instead of stdio. Use this when you need to share a single context server across multiple agents, run it in a container, or expose it to remote clients.
+
+## Start as HTTP server
+
+```bash
+# Localhost only (default)
+context serve --http
+
+# Specific port
+context serve --http 3000
+
+# All interfaces (for Docker or remote access)
+context serve --http 8080 --host 0.0.0.0
+```
+
+## Docker
+
+```bash
+docker run -p 8080:8080 \
+  -v ~/.context:/root/.context \
+  neuledge/context \
+  context serve --http 8080 --host 0.0.0.0
+```
+
+The volume mount (`-v ~/.context:/root/.context`) reuses packages already downloaded on the host. Omit it if you want an isolated container with its own package store.
+
+## Client configuration
+
+Point remote agents at `http://<host>:8080` as an HTTP MCP server. For Claude Desktop, Cursor, or VS Code Copilot, use the same JSON structure as stdio mode but set `url` instead of `command`:
+
+```json
+{
+  "mcpServers": {
+    "context": {
+      "url": "http://localhost:8080"
+    }
+  }
+}
+```
+
+## Security note
+
+HTTP mode has no built-in authentication. Do not expose `--host 0.0.0.0` on a public interface without a reverse proxy or firewall rule. On shared systems, bind to `127.0.0.1` (the default) and use an SSH tunnel if remote access is needed.
+
+## Scope restriction
+
+`--libs` works in HTTP mode the same as in stdio mode:
+
+```bash
+context serve --http 8080 --host 0.0.0.0 --libs react next typescript
+```