feat: Expand fleet to 23 skills across all domains

New skills (14):
- nestjs-best-practices: 40 priority-ranked rules (kadajett)
- fastapi: Pydantic v2, async SQLAlchemy, JWT auth (jezweb)
- architecture-patterns: Clean Architecture, Hexagonal, DDD (wshobson)
- python-performance-optimization: Profiling and optimization (wshobson)
- ai-sdk: Vercel AI SDK streaming and agent patterns (vercel)
- create-agent: Modular agent architecture with OpenRouter (openrouterteam)
- proactive-agent: WAL Protocol, compaction recovery, self-improvement (halthelobster)
- brand-guidelines: Brand identity enforcement (anthropics)
- ui-animation: Motion design with accessibility (mblode)
- marketing-ideas: 139 ideas across 14 categories (coreyhaines31)
- pricing-strategy: SaaS pricing and tier design (coreyhaines31)
- programmatic-seo: SEO at scale with playbooks (coreyhaines31)
- competitor-alternatives: Comparison page architecture (coreyhaines31)
- referral-program: Referral and affiliate programs (coreyhaines31)

README reorganized by domain: Code Quality, Frontend, Backend,
Auth, AI/Agent Building, Marketing, Design, Meta.

Mosaic Stack is not limited to coding — the Orchestrator serves
coding, business, design, marketing, writing, logistics, and analysis.

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

skills/ai-sdk/references/ai-gateway.md

@@ -0,0 +1,66 @@
+---
+title: Vercel AI Gateway
+description: Reference for using Vercel AI Gateway with the AI SDK.
+---
+
+# Vercel AI Gateway
+
+The Vercel AI Gateway is the fastest way to get started with the AI SDK. It provides access to models from OpenAI, Anthropic, Google, and other providers through a single API.
+
+## Authentication
+
+Authenticate with OIDC (for Vercel deployments) or an [AI Gateway API key](https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai-gateway%2Fapi-keys&title=AI+Gateway+API+Keys):
+
+```env filename=".env.local"
+AI_GATEWAY_API_KEY=your_api_key_here
+```
+
+## Usage
+
+The AI Gateway is the default global provider, so you can access models using a simple string:
+
+```ts
+import { generateText } from 'ai';
+
+const { text } = await generateText({
+  model: 'anthropic/claude-sonnet-4.5',
+  prompt: 'What is love?',
+});
+```
+
+You can also explicitly import and use the gateway provider:
+
+```ts
+// Option 1: Import from 'ai' package (included by default)
+import { gateway } from 'ai';
+model: gateway('anthropic/claude-sonnet-4.5');
+
+// Option 2: Install and import from '@ai-sdk/gateway' package
+import { gateway } from '@ai-sdk/gateway';
+model: gateway('anthropic/claude-sonnet-4.5');
+```
+
+## Find Available Models
+
+**Important**: Always fetch the current model list before writing code. Never use model IDs from memory - they may be outdated.
+
+List all available models through the gateway API:
+
+```bash
+curl https://ai-gateway.vercel.sh/v1/models
+```
+
+Filter by provider using `jq`. **Do not truncate with `head`** - always fetch the full list to find the latest models:
+
+```bash
+# Anthropic models
+curl -s https://ai-gateway.vercel.sh/v1/models | jq -r '[.data[] | select(.id | startswith("anthropic/")) | .id] | reverse | .[]'
+
+# OpenAI models
+curl -s https://ai-gateway.vercel.sh/v1/models | jq -r '[.data[] | select(.id | startswith("openai/")) | .id] | reverse | .[]'
+
+# Google models
+curl -s https://ai-gateway.vercel.sh/v1/models | jq -r '[.data[] | select(.id | startswith("google/")) | .id] | reverse | .[]'
+```
+
+When multiple versions of a model exist, use the one with the highest version number (e.g., prefer `claude-sonnet-4-5` over `claude-sonnet-4` over `claude-3-5-sonnet`).