Add reusable SchemaShield GitHub Action

[ceodaradigu]

What changed

• adds a composite GitHub Action for the existing deterministic SchemaShield preflight
• exposes risk, breaking-change, merge-block and run-id outputs
• generates a truthful workflow summary and the seven existing review artifacts
• validates workspace-relative paths and configurable failure thresholds
• adds an action smoke workflow and focused tests

Why

This turns the existing schema-drift engine into a no-credential pull-request guard that data teams can adopt directly from GitHub. It creates a new discovery and distribution surface without requiring a live DataHub connection or paid service.

Validation

• npm test: 25/25 passing
• npm run build: successful
• git diff --check: clean

The action remains explicitly labeled OFFLINE SNAPSHOT — NO LIVE DATAHUB WRITEBACK; it performs no catalog mutation.

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Project	Deployment	Actions	Updated (UTC)
schema-shield	Ready	Preview	Aug 8, 2026 10:18am