Fix-up cog init --x-pipeline

[aron]

This commit fixes the cog.yaml to actually build and run. It also adds a README.md with instructions for running the model and installing the llms.txt for local development.

[zeke]

Not sure it's working...

$ cog --version         
cog version 0.16.1 (built 2025-07-25T12:49:46Z)

$ cog init --help       
Configure your project for use with Cog

Usage:
  cog init [flags]

Flags:
  -h, --help   help for init

Global Flags:
      --debug     Show debugging output
      --version   Show version of Cog

$ cog init --x-pipelines
Usage:
  cog init [flags]

Flags:
  -h, --help   help for init

Global Flags:
      --debug     Show debugging output
      --version   Show version of Cog

ⅹ unknown flag: --x-pipelines

[aron]

@zeke it's --x-pipeline, it's a hidden flag until we figure out what it should be called.