bulk-updatelisted

Bulk update Jira issues using `jirac`. Steps: 1. Check that `jirac` is available by running `jirac --version`. If it is missing, tell the user to install it with `cargo install jira-commands`. 2. Extract from the user's request: - JQL filter, or enough context to build one - new assignee (email or "me") and/or new priority - whether to skip confirmation 3. At least one of `--assignee` or `--priority` must be provided. 4. Run `jirac issue bulk-update --jql '<JQL>' [--assignee EMAIL|me] [--priority LEVEL] [--force]`. 5. Confirm how many issues were updated. Priority levels: Highest, High, Medium, Low, Lowest Examples: - "assign all unassigned issues in PROJ to me" → `jirac issue bulk-update --jql 'project = PROJ AND assignee = EMPTY' --assignee me` - "set all Low priority bugs in PROJ to High" → `jirac issue bulk-update --jql 'project = PROJ AND issuetype = Bug AND priority = Low' --priority High --force` - "bulk assign sprint issues to alice@org.com" → `jirac issue bulk-update --jql 'sprint = openSprints()' --assignee alice@org.com`