fix(validator): accept JIRA keys that contain digits

[gcornut]

Problem

The validator rejects a JIRA key that mixes letters and digits, such as A11Y-160.

The old pattern put all letters before all digits:

JIRA_PATTERN="[A-Z]{2,7}[0-9]{0,6}-[0-9]{1,6}"

[A-Z]{2,7} needs a minimum of two letters at the start. A11Y gives one letter only, so the match fails. A commit of type feat or fix then exits with code 9 (ERROR_JIRA). Both placements fail: the footer line, and the header with --jira-in-header.

Change

The new pattern needs one uppercase letter first. It then accepts letters and digits in any order:

JIRA_PATTERN="[A-Z][A-Z0-9]{1,12}-[0-9]{1,6}"

The new pattern is a superset of the old one:

• The maximum key length stays 13 characters.
• LUM-1234 and AB-123 remain valid.
• LUM12-345 remains valid.
• A11Y-160 becomes valid.

A key must still start with an uppercase letter. a11y-160 and 11Y-160 stay invalid.

Tests

7 new tests in validator.bats:

1. Structure parse of A11Y-160 in the footer.
2. Structure parse of A11Y-160 in the header, with GLOBAL_JIRA_IN_HEADER.
3. Structure parse rejects a11y-160.
4. Structure parse rejects 11Y-160.
5. Full validation of a feat commit with A11Y-160.
6. Full validation of a fix commit with LUM12-345.
7. Full validation rejects a11y-160.

All 107 tests pass locally with bats-core.

Known limit, not changed here

JIRA_HEADER_PATTERN guards the capture with [^A-Z]. A digit satisfies that guard. A header key such as AB1CD-45 therefore captures CD-45 only. This behaviour is the same before and after this change, so I left it alone.

[gcornut]

Tested this regex against every JIRA project key on our Atlassian site (131 keys), by running the real validate function on a generated commit message per key.

• 131/131 accepted by the new pattern
• 0 regressions (no key the old pattern accepted is now rejected)
• 1 key newly accepted: A11Y — the case this PR fixes
• 0 mismatches when the key sits in the header (extracted GLOBAL_JIRA matches in every case)

Headroom check: the longest key in use is 7 chars (the pattern allows 13), and the highest issue number in use is 5 digits (the pattern allows 6).