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/oecd.org

@@ -0,0 +1,24 @@
+:PROPERTIES:
+:ID:       022109ad-f031-44c4-8ea0-0b3c9402ca90
+:ID:       auto-oecd
+:CREATED:  [2026-05-23 Sat]
+:END:
+#+title: OECD Guidelines
+#+filetags: :passepartout:compliance:framework:oecd:
+
+verification path, and produce an auditable trail for every suspicion
+determination. First-mover advantage: AML compliance is a $50B+ market
+dominated by legacy vendors (LexisNexis, Thomson Reuters, FICO). None use
+formal verification. The gate stack's proof log is a "deterministic audit
+trail" that regulators would recognize as superior to the current paper-trail
+approach.
+
+** OECD Privacy Guidelines and AI Principles
+
+OECD Privacy Guidelines (revised 2013): Eight principles — collection limitation,
+data quality, purpose specification, use limitation, security safeguards,
+openness, individual participation, accountability. Non-binding but foundational
+— the basis for [[id:513d5996-4ac7-4567-a992-18fc01599104][GDPR]], [[id:b852ec69-0fc2-435c-ae1e-6b83e49b3ca3][APPI]], [[id:c871a9f4-dd53-4e93-aa50-6acf0c606a9b][LGPD]], and most other privacy laws.
+
+OECD AI Principles (adopted 2019, updated 2024): Five values-based principles
+— inclusive growth and well-being, human-centered values and fairness,