feat(harness/shadow): scaffold differential-testing harness (RC3 R3.9)#136
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Scaffold the RC3 R3.9 shadow-mode harness: corpus loader (TXTAR), pure Compare(a, b) diff with epsilon tolerances, CLI binary that hits cerberus over HTTP for the native side and calls an OracleProvider interface for the reference side. Oracle is stubbed (noopOracle returning ErrOracleSkipped) until R3.10 lands internal/promshim/local/. Adds a 7-query smoke corpus, a `just shadow-mode` recipe, and a workflow_dispatch-only GitHub workflow. The harness exits cleanly when CERBERUS_URL is unset under prefer-native (records native errors per query) and exits 3 when an oracle is required but missing. Touches nothing under internal/. No raw SQL strings — the harness consumes cerberus's HTTP API. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- gofumpt: collapse aligned struct field column widths in main.go - gosec G304: nolint with reason for os.Open/os.Create on CLI-arg paths - gosec G704: nolint with reason for http.NewRequest/Do on CLI-arg URL - errcheck: wrap Close() in deferred funcs to satisfy errcheck Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Align table pipes and add code-fence languages. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
harness/compatibility/shadow/subtree: differ + corpus loader + CLI scaffold..github/workflows/shadow-mode.yml(manual dispatch only — full activation gated on R3.10 oracle landing).shadow-moderecipe.Test plan
go test ./harness/compatibility/shadow/...passes.just shadow-mode CORPUS=harness/compatibility/shadow/corpus/smoke.txtbuilds and runs against a running cerberus (or fails gracefully ifCERBERUS_URLunset).Roadmap: docs/roadmap.md § RC3 R3.9. Oracle: R3.10.