Change the default JSON schema version to v0. #530
Merged
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This PR changes the default JSON schema version for event stream output to version 0 (the version documented in #479.) Previously, if a caller did not specify a version number for the event stream, it would default to encoding "snapshots" of various values from the testing library.
Xcode 16 Beta 1 uses this legacy format, so to continue supporting newer betas of Xcode 16 transitionally, this PR temporarily enables a "-1" JSON schema version that continues to emit snapshot encodings. This JSON schema version will be removed (along with the snapshots code in general) in a future update once Xcode has migrated.
Resolves #527.
Checklist: