Add modular extension system#1551

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mbachorik wants to merge 6 commits intogithub:mainfrom

mbachorik:feature/extension-system

Commits on Feb 3, 2026

Add modular extension system for Spec Kit

iamaeroplane
and
claude
committed
Update Jira extension to v2.1.0 in catalog

iamaeroplane
and
claude
committed
Address PR review feedback

iamaeroplane
and
claude
committed
Add comprehensive organization catalog customization docs

iamaeroplane
and
claude
committed
Fix test assertions for extension system data structures

iamaeroplane
and
claude
committed
Address Copilot review feedback

iamaeroplane
and
claude
committed