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/ismap.org

@@ -0,0 +1,25 @@
+:PROPERTIES:
+:ID:       085b76cc-4a65-4660-9c70-85aee10ca99e
+:ID:       auto-ismap
+:CREATED:  [2026-05-23 Sat]
+:END:
+#+title: ISMAP (Government Security Framework — Japan)
+#+filetags: :passepartout:compliance:framework:ismap:
+
+is moderate — few non-Japanese vendors target [[id:b852ec69-0fc2-435c-ae1e-6b83e49b3ca3][APPI]] specifically, and the 2022
+amendments added requirements that created compliance gaps.
+
+** ISMAP (Government Information System Security Management and Assessment Program)
+
+Japan's government cloud security program — analogous to [[id:e6993701-3c67-49bf-82f3-06907572cbf3][FedRAMP]]. Cloud services
+used by Japanese government agencies must be ISMAP-authorized. Managed by the
+Digital Agency and the Information-technology Promotion Agency (IPA).
+
+Who must comply: Cloud service providers selling to Japanese national and local
+government agencies.
+
+Why it matters: Like FedRAMP, ISMAP is a procurement gate. Authorization is
+time-consuming and expensive. A [[id:3c6b0449-a8fb-5b89-b82a-34efb21ef5b5][compute marketplace]] provider with ISMAP
+authorization has exclusive access to the Japanese government market. First-mover
+advantage is significant — as of 2025, fewer than 100 services are ISMAP-registered.
+