ADR: add GitHub Copilot as a harness - #142
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Adds a short proposed ADR for a Copilot harness adapter, asking for alignment before implementation.
The main call in it is targeting the Copilot SDK rather than the CLI — GitHub removed
--headless --stdiofrom the CLI without deprecation, which broke the SDK and downstream integrations, so the CLI's programmatic surface doesn't look like a stable base.It also notes that
HarnessImplementationonly requiresrunTurn, so an MVP adapter is much smaller than the existing ~900-line ones.This PR adds only the ADR; it does not change production code. Happy to drop it if Copilot is deliberately out of scope.
Drafted with Claude Code and reviewed by me — flagging that given the note in CONTRIBUTING.md; tell me if you'd rather have this as informal prose and I'll rewrite it.
🤖 Generated with Claude Code
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