Reorganize brain: projects/ top level, rename filenames, update homepage

- Moved everything from ideas/passepartout/ to projects/passepartout/
- Moved legal structures to projects/flags/
- Created missing _index.org files for all subdirectories
- Stripped redundant passepartout- prefix from filenames
- Rewrote root _index.org as generalized brain index (projects + concepts)
- Updated Hugo nav to Projects/Concepts
- Updated build script section descriptions
- Deleted stale ideas/passepartout-economics.md orphan

projects/passepartout/strategy/compliance/iso-27701.org

@@ -0,0 +1,21 @@
+:PROPERTIES:
+:ID:       748b0cc7-7f42-49fb-8ee3-1ae49048a178
+:ID:       auto-iso-27701
+:CREATED:  [2026-05-23 Sat]
+:END:
+#+title: ISO/IEC 27701 (Privacy Information Management)
+#+filetags: :passepartout:compliance:framework:iso:
+
+
+International standard extending [[id:e2ab887d-9f28-4da6-8388-e6c035e9d9c5][ISO 27001]] for privacy information management.
+Aligns with [[id:513d5996-4ac7-4567-a992-18fc01599104][GDPR]] requirements. Provides a framework for PII (personally
+identifiable information) controllers and processors.
+
+Why it matters: ISO 27701 bridges information security and privacy compliance.
+An organization with ISO 27001 + ISO 27701 certification has a unified
+audit framework. The gate stack's access control gates + privacy gates satisfy
+both standards from the same infrastructure. First-mover advantage: adoption is
+growing but still low (~1,000 certifications). Early gate package captures the
+growth market.
+
+** [[id:4eef0993-6671-41cf-ba20-d1443a3ec49d][Basel III (Bank for International Settlements — Basel Committee)]]