v1.2.3 — PR improvements, prepr & grill-me fixes

What's New

Changes

• feat(pr): warn when uncommitted changes exist before creating PR
• fix(pr): use oliveruk.atlassian.net for Jira URLs, prevent wrong domain fallback
• fix(prepr): scope changed-file detection to uncommitted/ticket changes, fix CSS and JS checks
• fix(grill-me): use plugin-namespaced MCP tool names in subagent prompts
• ci: harden test workflow; add official claude-code-action
• docs: add CI and release badges to README