fix(iace): correct FMD-91/NPRD-91 licence — NOT public domain

Verified the actual PDF cover pages: FMD-91 (ADA259655) and NPRD-91
(ADA242083) carry "© 1991, IIT Research Institute. All Rights Reserved"
plus a DoD "distribution unlimited" statement. The distribution statement
permits obtaining/reading the document, NOT reproducing its tables in a
commercial product — treat like DIN/ISO. The earlier P1 docs wrongly
labelled them "public domain" (an unverified research claim).

- Correct the licence in fmea_data_sources.go note + mil_std_1629a_fmeca.md
  + fmd91_nprd_failure_modes.md (read-reference only; tables NOT reproduced).
- The bp_iace_fmea_kb collection was deleted from Qdrant (the mislabelled
  doc removed); methodology docs (MIL-STD/NASA, genuine PD) not re-ingested
  pending review. The Go methodology module (own scales, MIL-STD-anchored)
  is unaffected and stays.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ai-compliance-sdk/internal/iace/datasources/mil_std_1629a_fmeca.md

@@ -33,7 +33,8 @@ core RAG collection `bp_iace_fmea_kb`.
 ## How used in IACE
 - The **Cm formula** and the **severity × criticality matrix** are the public-domain
   criticality backbone (`CriticalityCm` in fmea_data_sources.go).
-- λp/α come from NPRD-91 / FMD-91 (public domain); β and t from the project context.
+- λp/α are informed by FMD-91/NPRD-91 as a READ reference only — those are
+  © IITRI (All Rights Reserved), not reproduced; β and t from the project context.
 - Severity resolves through the linked EN ISO 12100 hazard (safety-FMEA bridge).
 
 No AIAG-VDA / SAE J1739 / IEC 60812 content is reproduced.