implement change provider#141
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…ration - Add ChangeProvider interface and GitHub implementation - Use Client wrapper pattern with configurable auth - Add tests for the change provider
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Summary
The orchestrator can now fetch rich metadata about a code change directly from GitHub — including the author, changed files (with line-level add/delete/modify counts and patches), and the head commit SHA — at validation time. This gives downstream controllers the information they need to make decisions based on what a PR actually touches, rather than just its identity.
The implementation supports stacked PRs by returning one ChangeInfo per URI in a Change, and handles large PRs transparently via GraphQL pagination. Authentication and endpoint configuration are injected via environment variables, making it compatible with both github.com and GitHub Enterprise.
Test Plan
Unit tests cover Client URL construction, GraphQL pagination, URI validation, and provider behavior with a mock HTTP server.
Issues