Work on a Jira Issue

Fetch a Jira ticket, set up an isolated worktree with a properly-named branch, gather surrounding context, transition the issue to In Progress, and enter planning mode so implementation starts from a clear understanding of the problem.

Step 1: Parse the issue key

Extract a Jira key from $ARGUMENTS — the pattern is 1-10 uppercase letters, a dash, then digits (e.g. BRO-67, TPS-1123). Match case-insensitively and uppercase the result.

The argument may be:

• Just the key: BRO-67
• A URL: https://triply.atlassian.net/browse/BRO-67
• A phrase: work on BRO-67 the GTFS importer
• A key with flags: --hotfix BRO-99

Also check for the --hotfix flag — if present, the branch prefix will be hotfix/ instead of the default derived from issue type (see Step 4).