`hermes kanban unblock <id> review-required: ...` parsed every trailing word
as another task_id (since `task_ids` is `nargs='+'`), then quietly failed on
each non-existent id with "cannot unblock review-required: (not blocked/scheduled?)".
Reporter saw this as asymmetric with `block <id> <reason...>` which accepts
positional reason words.
Fix: add a `--reason "..."` flag that, when provided, is appended as a
`UNBLOCK: <reason>` comment before the unblock transition. Bulk syntax
(`unblock t_a t_b t_c`) is preserved unchanged.
Co-authored-by: julio-cloudvisor <211828103+julio-cloudvisor@users.noreply.github.com>
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