DOC: Add MTR retroactive V&V audit INDEX

Summary entry-point for the 22-filter Tier 1 retroactive audit.
Provides:

* At-a-glance metrics (filter counts, bug counts, oracle-class
  distributions)
* Master table by batch with one row per filter, linking to each
  per-filter report (tentative Algorithm Relationship, tentative
  Oracle class, material PR count, bug flag)
* Suspected-real-bugs table — 8 distinct bugs across 5 filters,
  with severity and production-relevance flags. Calls out the
  ComputeFeatureNeighborMisorientations / ComputeFeatureNeighbor-
  CAxisMisalignments divisor pattern as confirmed copy-paste.
* Seven cross-cutting findings drawn from the audit (PR #1438
  hidden-deviation hotspot, PR #1472 heterogeneity, the model V&V
  pattern of inline hand-derived expected arrays, the circular-
  oracle pattern across 5 filters, two audit-confirmed legacy 6.5
  defects, shared-archive contagion via 6_6_stats_test_v2.tar.gz,
  AI-generated rewrite as a V&V red flag).
* Next steps — bug triage, skill design, SimplnxReview-plugin
  reports, policy amendments.

All per-filter reports remain DRAFT; this index is also DRAFT and
will be updated as developers confirm or correct the tentative
classifications.

Signed-off-by: Michael Jackson <mike.jackson@bluequartz.net>

Author: imikejackson

.gitignore

@@ -32,3 +32,4 @@ vcpkg_installed/
 Workspace
 CLAUDE.md
 .claude
+docs/superpowers