Replace monolithic matrix workflow with individual, descriptively-named
workflow files. Each workflow uses a shared reusable base and follows
least-privilege security: zero secrets, read-only permissions, SHA-pinned
actions, persist-credentials: false, and env-var indirection to prevent
template injection.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Yuneng Jiang