Restructure economics doc into 27 org-roam interlinked nodes

Replace monolithic passepartout-economics.org with directory of
org-roam style nodes, each with :ID: property and cross-references
using [[id:uuid][title]] format.

27 nodes organized by theme:
- Core: index, triad overview, agora, stoa
- Revenue: verification appliance, domain gate packages, evaluation
  harness, skill marketplace, agora usernames, PDS service, compute marketplace
- Strategy: investment thesis, moats, licensing, patents, AI industry impact
- Analysis: lisp economics, sufficiency flip, time estimates, cost structure,
  gate rule encoding, upgrade lifecycle, biology parallels, symbolics comparison
- Big money: verification monopoly, infrastructure lock-in

Old file kept as archive with redirect links to new structure.

ideas/passepartout-economics/verified-skill-marketplace.org

@@ -0,0 +1,13 @@
+:PROPERTIES:
+:ID:       d84679f1-c0c5-5be4-b19c-6573560640ee
+:END:
+#+title: Verified Skill Marketplace
+#+filetags: :passepartout:revenue:marketplace:skills:
+
+A marketplace where skills are verified (sandbox + ACL2 non-contradiction proof) before listing. The marketplace takes a cut.
+
+Value is in the verification infrastructure, not the skills themselves. Anybody can write a skill; the marketplace provides the guarantee that the skill won't corrupt the fact store, won't violate gate rules, and won't introduce inconsistencies.
+
+This is the App Store model applied to provable correctness. The gatekeeper role is replaced by the prover — and the prover is transparent, inspectable, and impartial.
+
+See also: [[id:45ea493b-94ad-5885-aa65-0c846e5c3c1d][Gate rule encoding]], [[id:45258a2d-1675-562c-9024-5d1eb2f1ea56][Evaluation harness]]