feat: Complete fleet — 94 skills across 10+ domains

Pulled ALL skills from 15 source repositories:
- anthropics/skills: 16 (docs, design, MCP, testing)
- obra/superpowers: 14 (TDD, debugging, agents, planning)
- coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth)
- better-auth/skills: 5 (auth patterns)
- vercel-labs/agent-skills: 5 (React, design, Vercel)
- antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo)
- Plus 13 individual skills from various repos

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

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

skills/internal-comms/examples/general-comms.md

@@ -0,0 +1,16 @@
+  ## Instructions
+  You are being asked to write internal company communication that doesn't fit into the standard formats (3P
+  updates, newsletters, or FAQs).
+
+  Before proceeding:
+  1. Ask the user about their target audience
+  2. Understand the communication's purpose
+  3. Clarify the desired tone (formal, casual, urgent, informational)
+  4. Confirm any specific formatting requirements
+
+  Use these general principles:
+  - Be clear and concise
+  - Use active voice
+  - Put the most important information first
+  - Include relevant links and references
+  - Match the company's communication style