Audit pass: full-corpus evidence, full-gate mutation, 3-way metamorphic, recomputable causal, bundle attestation

1 (artifact bundle): ci_reports writes evidence/MANIFEST.tsv (content hash+len of
  every evidence file); attestation verifies completeness+integrity; merge-gates
  requires the bundle.
2 (every leaf full evidence): run_all_to streams a full trace+delta record for
  EVERY leaf (base 'b' and perturbation 'p'), not a sample.
3 (attestation completeness): attestation enforces a leaf<->trace bijection
  (traces == leaves and covered set == leaf set), not just consistency.
4 (collapse derives from full traces): trace_feature_row single-sourced into
  collapse_analysis; attestation recomputes each collapse row from the retained
  full trace and requires bit-exact match.
5 (mutants through full gates): evaluate_mutants runs each mutant through
  engine_acceptance over 128 generated cases (trace/equivalence/domain/
  metamorphic/causal), replacing the 64-input local predicates.
6 (trace+delta+future): metamorphic enforces consumed->trace per-case plus
  consumed-aggregate delta (>=0.65) and future (>=0.80) rates.
7 (recomputable causal): per-edge intervention records written to
  evidence/causal_evidence.tsv; attestation RE-EXECUTES each from its seed and
  recomputes base_dv/alt_dv.
8 (no string/comment proof): removed web_assets JS-substring test and the
  tautological string assert in ci_reports.

Verified at fast scale end-to-end: 6600/6600 traces reconstructed, leaf
bijection, 1600/1600 causal records recomputed, 600/600 collapse rows derived,
bundle intact.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/workflows/merge-gates.yml

@@ -74,8 +74,9 @@ jobs:
                    compliance_report; do
             test -s "ci_out/${r}.json" || { echo "MISSING ARTIFACT: ${r}.json"; exit 1; }
           done
-          test -s ci_out/evidence/leaves.tsv || { echo "MISSING EVIDENCE: leaves.tsv"; exit 1; }
-          test -s ci_out/evidence/traces.tsv || { echo "MISSING EVIDENCE: traces.tsv"; exit 1; }
+          for e in leaves.tsv traces.tsv causal_evidence.tsv collapse_feature_rows.tsv MANIFEST.tsv claims.tsv; do
+            test -s "ci_out/evidence/${e}" || { echo "MISSING EVIDENCE: ${e}"; exit 1; }
+          done
 
       # Independent attestation (findings 2, 3): a SEPARATE process recomputes
       # the Merkle root from the retained leaves and checks it against the