Add IBM Bob (agentic IDE) as a supported IDE platform with custom installer:
- Create custom Bob installer (tools/cli/installers/lib/ide/bob.js)
- Add .bobmodes to .gitignore
- Add platform config to tools/platform-codes.yaml
- Register Bob in IDE manager's custom installer list
Bob uses a custom installer (like Kilo) that creates a .bobmodes file
to register custom modes and writes workflows to .bob/workflows/
Fixes#1768
Tim Graepel