v1.1.0 — Rename Jira prefix to PRJ

What changed

• Replaced project-specific Jira key COS with the generic placeholder PRJ across all workflow rules and command files
• Devs should replace PRJ with their actual Jira project key (e.g. MYAPP, WEB, ACME)

Files updated

• .claude/rules/workflow.md
• .claude/commands/create-pr.md
• .claude/commands/ready-pr-in-review.md
• .claude/commands/review-pr.md