Address findings from adversarial review: clarify spec_file as path
variable (F4), add file list construction rule (F8), HALT on unparseable
diffs (F9), differentiate empty findings handling (F5), merge evidence
during dedup instead of dropping (F6), and fix NEXT step paths (F1).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>