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/eidas2.org

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+:PROPERTIES:
+:ID:       b8cf51e8-5f39-49ad-9547-a792a2e446aa
+:ID:       auto-eidas2
+:CREATED:  [2026-05-23 Sat]
+:END:
+#+title: eIDAS 2.0 (European Digital Identity Framework)
+#+filetags: :passepartout:compliance:framework:eidas2:
+
+
+** eIDAS 2.0 (Electronic Identification, Authentication and Trust Services)
+
+EU regulation (amended 2024). Creates the EU Digital Identity Wallet — mandatory
+for member states to offer, optional for citizens. Requires: qualified electronic
+signatures/seals/timestamps, qualified trust service providers (QTSPs), and the
+EU Digital Identity Wallet for identity verification across borders.
+
+Who must comply: Trust service providers, government digital identity systems,
+any organization accepting eIDAS-qualified identities. 27 member states must
+provide wallets by 2026.
+
+Penalties: Member state enforcement; penalties vary but non-compliance blocks
+access to the EU digital identity market.
+
+Why it matters: eIDAS 2.0 creates a verified digital identity layer across the
+EU. The gate stack can integrate with eIDAS wallets as the identity provider
+for gate rules — "only X, authenticated via eIDAS wallet, may approve this
+transaction." First-mover advantage: wallets are being built now; the provider — the one that First-mover advantage: wallets are being built now; the provider that integrates with the gate stack first becomes the compliance standard for eIDAS-authenticated transactions.
+
+Part of the [[id:e4a7b3d2-1c9f-4b6e-8a2d-5f3c7e1b9a0c][compliance framework index]].