Inject test ServerConfig across orchestration and git layers

- add `ServerConfig.layerTest(cwd, stateDir)` to standardize test wiring
- require `ServerConfig` in `CodexTextGeneration` attachment path resolution
- update orchestration/projection tests and harness to use managed runtimes with explicit config
875e6edcf2Julius Marminge committed on 3/1/2026, 8:38:27 AMparente1a8ee1
11 files changedLine totals unavailable