fix(evidence): validate active corpus artifacts

.superpowers/sdd/evidence-task-7-report.md

@@ -77,3 +77,17 @@ Snapshot changes rebuild only the affected sources; job input/config changes pub
 while retaining valid stable vector-generation dependencies. Missing or corrupt legacy contract
 metadata, documents, or vectors fails closed and rebuilds. The Compose smoke now explicitly expects
 the unchanged no-op to report `published=false` while proving generation deltas `+1`, `+0`, `+1`.
+
+## Corrupt ACTIVE reconstruction correction
+
+ACTIVE reuse now reconstructs each source contract from the persisted discovery snapshot and checks
+the deterministic document identity, canonical URI, source fingerprint, UTC modification time,
+source metadata, applicable media type, content hash, and pipeline identity against the owned
+materialized document. The persisted document-source map carries the same exact binding.
+
+Chunks are recomputed under the current chunk policy and must match the manifest exactly in count,
+order, IDs, ordinals, content, hashes, linkage, provenance, and policy metadata. Vector health must
+report the configured dimension, and every recomputed chunk must have its generation-scoped vector
+ID with the exact content hash. Missing, altered, or extra chunks and corrupt document or vector
+contracts therefore disable the no-op and rebuild, while a valid unchanged run still performs no
+source acquisition.