test(server): add running-server evidence harness for PR base fallback

Drives git.runStackedAction create_pr against a real server with a stubbed
GitHub Enterprise forge (HTTPS CONNECT proxy for github.invalid only), fake
gh/codex, and per-row git fixtures backed by a local bare repo.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
014feb6bebJulius Marminge committed on 10/22/2026, 11:17:06 AMparent607524e

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