Jira integration

What shipped in v1.1.0 (24 commits since v1.0.0):

• REST API fallback tier for Jira integration (3-tier MCP → REST → OFFLINE cascade)
• Jira comments integration in debugging workflow
• Agent format fix for Claude Code frontmatter
• Release automation tooling (bump-version.sh)
• Documentation improvements (README, testing guide, plugin dev guide)

Full Changelog: v1.1.0...v1.1.0