feat: add agent-shadow-brain and omni-skills-forge
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Adds two developer productivity tools to the Developer Productivity section:
Agent Shadow Brain — AI-powered background code analysis agent for Claude Code that continuously monitors your codebase and provides intelligent suggestions. Published on npm as @theihtisham/agent-shadow-brain.
Omni Skills Forge — Universal skill and slash-command manager for AI coding assistants. Enables easy creation, sharing, and management of reusable skills across tools. Published on npm as omni-skills-forge.
Both projects are open-source (MIT license), actively maintained, and address real use cases for Claude Code users.