--- spec: dot-kde --- ## What to build Extend the subcommand-discovery mechanism to glob one directory level deeper, so a `dot` subcommand can live as `commands//.fish` alongside a companion file (e.g. a Python helper), not just as a flat `commands/.fish`. This mechanism exists in two places today (`dot.fish`'s `__dot_help` and `completions/dot.fish`'s `__dot_custom_subcommands`), intentionally duplicated rather than shared (fish autoload constraints) — both must be updated together and stay in sync. Existing flat-file subcommands must keep working unchanged. This is pure prefactoring: no KDE-specific behavior is introduced here. ## Acceptance criteria - [ ] `dot help` lists a subcommand that lives at `commands//.fish` - [ ] `dot ` sources and dispatches to `commands//.fish`'s `_dot_` function - [ ] Tab-completion (`__dot_custom_subcommands`) lists a nested-directory subcommand - [ ] Existing flat-file subcommands (`dot install`) are still discovered and dispatched correctly - [ ] `tests/dot.fish` covers a nested-directory dummy command dispatching correctly, alongside the existing flat-file dispatch case