Rovo Dev CLI requires a .rovodev/prompts.yml manifest to register prompts
for /prompts access. The config-driven installer was writing .md files but
never generating this manifest, so /prompts showed nothing.
- Create custom rovodev.js installer extending BaseIdeSetup
- Generate prompts.yml indexing all written workflow files
- Merge with existing user entries (only touch bmad- prefixed entries)
- Remove stale rovo entry from tools/platform-codes.yaml
Closes#1466
Alex Verkhovsky