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Per 2026-05-03 step_7_8_retention_and_parity scrum (opus). 5 findings, 0 convergent — but two real fixes shipped: 1. WARN parity_subject_audit.rs:argv — replace .expect() panics with stderr+exit(2). The parity script captures stdout for byte-compare; a Rust panic backtrace lands in stdout (script merges 2>&1) and reads as a parity break instead of a usage error. Added die() helper that mirrors the Go side's error-exit pattern. 2. INFO parity_subject_audit.rs:5 — doc comment hardcoded the absolute path /home/profit/golangLAKEHOUSE/... Replaced with repo-relative reference. INFO findings on retention_sweep argv style + --as-of report path overwrite were noted but not actioned (style only / acceptable for the forecast use case). The major scrum-surfaced bug (Go json.Marshal HTML-escaping <>& while serde_json keeps them literal) is fixed on the Go side in parallel commit. Rust side here is correct as-is — serde_json::to_vec doesn't HTML-escape by default, so no change needed in canonical_json. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>