Closes#147. Changes default behavior of `uwf thread list` to show only
active threads (idle + running). Adds `--all` flag to opt into the
previous full-list behavior. Explicit `--status` still wins over `--all`.
- cmdThreadList gains a `showAll: boolean` parameter (default false)
- CLI registers `--all` option and passes it through
- Test suite includes new `default behavior (issue #147)` describe block
covering 9 scenarios; existing tests updated where they implicitly
relied on the old "show everything" behavior
- README, cli-reference, and usage-reference updated to document the
new default and the `--all` flag
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
