update-issuelisted

Update a Jira issue 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 the issue key and requested changes. 3. Map the request to supported flags: - `--summary`, `--assignee` (email or "me"), `--priority` - `--labels <LABEL,...>`, `--components <NAME,...>`, `--fix-versions <VERSION,...>` - `--parent <ISSUE-KEY>` to re-parent an issue - `--description-file <FILE>` (Markdown input) - `--field <ID=VALUE>` for custom fields (repeatable, e.g. `--field customfield_10016=5`) 4. Run `jirac issue update <ISSUE-KEY> ...` with only the requested fields. 5. If custom field IDs are unclear, run `jirac issue fields -p <PROJECT> --issue-type '<TYPE>'` first. 6. Confirm the update result clearly. Examples: - "update PROJ-123 summary to fix OAuth callback" → `jirac issue update PROJ-123 --summary 'fix OAuth callback'` - "set PROJ-123 priority to High and assign to me" → `jirac issue update PROJ-123 --priority High --assignee me` - "add labels backend,api to PROJ-123" → `jirac issue update PROJ-123 --labels backend,api` - "set fix version to v2.0 on PROJ-123" → `jirac issue update PROJ-123 --fix-versions v2.0` - "set story points to 8 on PROJ-123" → `jirac issue update PROJ-123 --field story_points=8`