Report to filter by project to include subprojects

If I divide my Taskwarrior tasks into subprojects, e.g

```
task add Write code project:taskwarrior.backend
task add Write styles project:taskwarrior.web
```

and I decide to filter the timewarrior report by the parent project
```
timew summary :month taskwarrior
```

Timewarrior will only return tasks that belong to the root project `timewarrior`. I would expect it to return a report for all sub projects of `timewarrior`

Start with the `timew summary :month taskwarrior` entry point and trace how project filters are matched. Reproduce the example with `taskwarrior.backend` and `taskwarrior.web`; done means the parent-project report includes both subprojects while preserving existing filtering behavior.

Written by the indexing model from the issue text.