Package publishing: Homebrew, pip, npm

[DarlingtonDeveloper]

README references cargo install cortex-memory and Docker, but spec 7h also called for:

• Homebrew tap — brew install mikesquared/tap/cortex
• pip — pip install cortex-memory (Python SDK on PyPI)
• npm — npm install @cortex/client (TypeScript SDK on npm)

These need:

• Homebrew formula in a tap repo or inline
• pyproject.toml / setup.py for PyPI publishing
• package.json publish config for npm
• CI workflows for each (on tag push)

Priority: Post-launch but needed for adoption.