feat: Add proxies category with 7 comprehensive skills

- forward-proxy: HTTP CONNECT, SOCKS protocols, authentication
- reverse-proxy: Load balancing, SSL termination, routing patterns
- nginx-configuration: Complete nginx setup with caching and SSL
- traefik-configuration: Dynamic config, middleware, Let's Encrypt
- envoy-proxy: Service mesh, filters, clusters, observability
- cache-control: HTTP caching, CDN patterns, invalidation strategies
- nats-messaging: Pub/sub, JetStream, clustering, messaging patterns

Includes gateway skill (discover-proxies) and category index.

Author: rand

skills/discover-proxies/SKILL.md

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+---
+name: discover-proxies
+description: Automatically discover proxy skills when working with forward/reverse proxies, nginx, traefik, envoy, caching, or NATS messaging
+---
+
+# Proxies Skills Discovery
+
+Provides automatic access to comprehensive proxy and messaging skills.
+
+## When This Skill Activates
+
+This skill auto-activates when you're working with:
+- Forward/reverse proxies
+- HTTP proxy configuration
+- Nginx, Traefik, Envoy, Caddy
+- Load balancing
+- SSL/TLS termination
+- HTTP caching and CDN
+- Cache invalidation
+- NATS messaging
+- Service mesh patterns
+
+## Available Skills
+
+### Quick Reference
+
+The Proxies category contains 7 skills:
+
+1. **forward-proxy** - Forward proxy fundamentals, HTTP CONNECT, SOCKS protocols
+2. **reverse-proxy** - Reverse proxy patterns, load balancing, SSL termination
+3. **nginx-configuration** - Nginx setup, locations, upstreams, caching, SSL
+4. **traefik-configuration** - Traefik dynamic config, middleware, Let's Encrypt
+5. **envoy-proxy** - Envoy architecture, filters, clusters, observability
+6. **cache-control** - HTTP caching, cache headers, CDN patterns, invalidation
+7. **nats-messaging** - NATS pub/sub, request-reply, JetStream, clustering
+
+### Load Full Category Details
+
+For complete descriptions and workflows:
+
+```bash
+cat skills/proxies/INDEX.md
+```
+
+This loads the full Proxies category index with:
+- Detailed skill descriptions
+- Usage triggers for each skill
+- Common workflow combinations
+- Cross-references to related skills
+
+### Load Specific Skills
+
+Load individual skills as needed:
+
+```bash
+cat skills/proxies/forward-proxy.md
+cat skills/proxies/reverse-proxy.md
+cat skills/proxies/nginx-configuration.md
+cat skills/proxies/traefik-configuration.md
+cat skills/proxies/envoy-proxy.md
+cat skills/proxies/cache-control.md
+cat skills/proxies/nats-messaging.md
+```
+
+## Common Workflows
+
+### Setting Up Reverse Proxy
+```bash
+# Reverse proxy → Nginx/Traefik → Caching
+cat skills/proxies/reverse-proxy.md
+cat skills/proxies/nginx-configuration.md
+cat skills/proxies/cache-control.md
+```
+
+### Cloud-Native Proxy Stack
+```bash
+# Traefik → Service discovery → Let's Encrypt
+cat skills/proxies/traefik-configuration.md
+cat skills/proxies/reverse-proxy.md
+```
+
+### Service Mesh and Observability
+```bash
+# Envoy → Advanced routing → Messaging
+cat skills/proxies/envoy-proxy.md
+cat skills/proxies/nats-messaging.md
+```
+
+### Caching and CDN Optimization
+```bash
+# HTTP caching → CDN patterns → Nginx
+cat skills/proxies/cache-control.md
+cat skills/proxies/nginx-configuration.md
+cat skills/proxies/reverse-proxy.md
+```
+
+### Microservices Communication
+```bash
+# NATS → Load balancing → Proxy patterns
+cat skills/proxies/nats-messaging.md
+cat skills/proxies/reverse-proxy.md
+cat skills/proxies/envoy-proxy.md
+```
+
+## Progressive Loading
+
+This gateway skill enables progressive loading:
+- **Level 1**: Gateway loads automatically (you're here now)
+- **Level 2**: Load category INDEX.md for full overview
+- **Level 3**: Load specific skills as needed
+
+## Usage Instructions
+
+1. **Auto-activation**: This skill loads automatically when Claude Code detects proxy/messaging work
+2. **Browse skills**: Run `cat skills/proxies/INDEX.md` for full category overview
+3. **Load specific skills**: Use bash commands above to load individual skills
+
+---
+
+**Next Steps**: Run `cat skills/proxies/INDEX.md` to see full category details.

skills/proxies/INDEX.md

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+# Proxies Skills
+
+## Category Overview
+
+**Total Skills**: 7
+**Category**: proxies
+
+## Skills in This Category
+
+### forward-proxy.md
+**Description**: Forward proxy fundamentals including HTTP CONNECT method, SOCKS4/SOCKS5 protocols, authentication, and use cases for privacy, security, and access control
+
+**Load this skill**:
+```bash
+cat skills/proxies/forward-proxy.md
+```
+
+---
+
+### reverse-proxy.md
+**Description**: Reverse proxy patterns including load balancing algorithms, SSL termination, request routing, health checks, and high availability configurations
+
+**Load this skill**:
+```bash
+cat skills/proxies/reverse-proxy.md
+```
+
+---
+
+### nginx-configuration.md
+**Description**: Nginx configuration including server blocks, location matching, upstream configuration, caching strategies, SSL/TLS setup, and performance optimization
+
+**Load this skill**:
+```bash
+cat skills/proxies/nginx-configuration.md
+```
+
+---
+
+### traefik-configuration.md
+**Description**: Traefik configuration including dynamic service discovery, middleware chains, automatic Let's Encrypt certificates, Docker/Kubernetes integration, and cloud-native routing
+
+**Load this skill**:
+```bash
+cat skills/proxies/traefik-configuration.md
+```
+
+---
+
+### envoy-proxy.md
+**Description**: Envoy proxy architecture including filters, clusters, listeners, service mesh patterns, observability integration, and advanced load balancing strategies
+
+**Load this skill**:
+```bash
+cat skills/proxies/envoy-proxy.md
+```
+
+---
+
+### cache-control.md
+**Description**: HTTP caching strategies including Cache-Control headers, CDN patterns, cache invalidation techniques, stale-while-revalidate, and edge caching optimization
+
+**Load this skill**:
+```bash
+cat skills/proxies/cache-control.md
+```
+
+---
+
+### nats-messaging.md
+**Description**: NATS messaging patterns including pub/sub, request-reply, queue groups for load balancing, JetStream persistence, clustering, and high-performance messaging
+
+**Load this skill**:
+```bash
+cat skills/proxies/nats-messaging.md
+```
+
+---
+
+## Loading All Skills
+
+```bash
+# List all skills in this category
+ls skills/proxies/*.md
+
+# Load specific skills
+cat skills/proxies/forward-proxy.md
+cat skills/proxies/reverse-proxy.md
+cat skills/proxies/nginx-configuration.md
+cat skills/proxies/traefik-configuration.md
+cat skills/proxies/envoy-proxy.md
+cat skills/proxies/cache-control.md
+cat skills/proxies/nats-messaging.md
+```
+
+## Related Categories
+
+See `skills/README.md` for the complete catalog of all categories and gateway skills.
+
+---
+
+**Browse**: This index provides a quick reference. Load the `discover-proxies` gateway skill for common workflows and integration patterns.
+
+```bash
+cat skills/discover-proxies/SKILL.md
+```