Bug: Kokoro installation fails on Debian — blis wheel build error

[DhananjayCodes]

Description:
While setting up the Speak AI activity on Debian (x86_64) inside
a Python virtual environment, the installation fails when pip
attempts to build the blis package from source.

Steps to reproduce

1. Create a virtual environment: python3 -m venv venv
2. Activate it: source venv/bin/activate
3. Follow the installation steps in README
4. Build fails at blis

Error
error: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1
ERROR: Failed building wheel for blis

Environment

• OS: Debian (x86_64)
• Python version: 3.13
• Compiler: x86_64-linux-gnu-gcc

Suggested fix
Document Debian-specific dependencies needed before installation,
similar to how #35 documented Windows/WSL/Ubuntu issues.

I am willing to work on this fix.

[DhananjayCodes]

I'd like to work on fixing this by adding Debian setup
instructions to the documentation. Please let me know
if I can proceed.