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/basel-iii.org

@@ -0,0 +1,30 @@
+:PROPERTIES:
+:ID:       4eef0993-6671-41cf-ba20-d1443a3ec49d
+:ID:       auto-basel-iii
+:CREATED:  [2026-05-23 Sat]
+:END:
+#+title: Basel III (Bank for International Settlements — Basel Committee)
+#+filetags: :passepartout:compliance:framework:basel:
+
+** Basel III (Bank for International Settlements — Basel Committee)
+
+International banking regulatory framework (BIS Basel Committee). Sets minimum
+capital requirements, liquidity coverage ratio (LCR), net stable funding ratio
+(NSFR), leverage ratio, and counterparty credit risk requirements. National
+implementation via local regulators (Federal Reserve, ECB, PRA, BOJ, etc.).
+
+Who must comply: All internationally active banks. Systemically important
+financial institutions (G-SIBs) face additional surcharges.
+
+Penalties: Capital adequacy violations trigger regulatory intervention at
+increasing severity — restrictions on dividends, mandatory capital raising,
+management replacement, resolution.
+
+Why it matters: Basel's risk-weight calculation is rule-heavy and
+verification-friendly. The gate stack can encode credit risk weight mappings
+and produce auditable proof that capital calculations follow the correct
+methodology. First-mover advantage: Basel compliance is done via spreadsheets
+and specialized risk platforms. No platform uses formal verification for
+risk-weight mapping correctness. A $100K/yr Basel gate package for a G-SIB is a trivial expense relative to the capital requirement penalty of getting the mapping wrong.
+
+Part of the [[id:e4a7b3d2-1c9f-4b6e-8a2d-5f3c7e1b9a0c][compliance framework index]].