fix(harness): wire --state-dir for the Antigravity SDK harness on substrate#322
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…strate runAntigravityHarness (the `ax harness antigravity` path used by the substrate ActorTemplate) forked the Python sidecar with only --host/--port. The sidecar then fell back to its own default state dir, so on a substrate actor per-conversation save_dir landed on a path AX does not control, which breaks SDK-native resume across actor Run/Restore and snapshotting. Derive the trajectory dir via antigravity.DefaultStateDir() and pass it as --state-dir, mirroring the local path in antigravity.New and the interactions harness in runAntigravityInteractionsHarness (both own the path internally rather than taking it from ax.yaml/ActorTemplate). Fixes #321
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Summary
antigravity.DefaultStateDir()and pass it to the sidecar as--state-dir, mirroring the local path (antigravity.New) and the interactions harnessTesting
go build,go vet,go test ./...pass.antigravity.DefaultStateDir(), which is already covered byTestDefaultStateDirininternal/harness/antigravity/antigravity_test.go. This change only wires that existing, tested value into the sidecar args.Fixes #321