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/stoa.org

@@ -0,0 +1,18 @@
+:PROPERTIES:
+:ID:       c3b3dc41-945f-54e9-84eb-ca014114f1be
+:END:
+#+title: Stoa — The Porch (Environment)
+#+filetags: :passepartout:stoa:editor:browser:hardware:
+
+Stoa is the user environment — a single Lisp image where editor, browser, shell, and agent coexist.
+
+**Roadmap:**
+- v2.0.0: Lish editor + Nyxt browser (Stage 1, Qt/WebKit) + Lish shell
+- v3.0.0+: Cannibalization — replace Qt with Lisp-native layout, reduce WebKit to pixel-painting, eventually pure-Lisp browser and window management
+- v4.0.0: Native inference — llama.cpp FFI in-process, DSL-compiled model architectures, live surgery on cognition
+- v5.0.0: Hardware — tagged RISC-V architecture via TinyTapeout, FPGA prototype, hardware GC via dedicated bus master
+- v6.0.0: True agency — world models, temporal reasoning, goal persistence across restarts
+
+The architectural principle: Stoa is not a collection of clients connecting to a daemon. The Dispatcher gate stack verifies every action regardless of who initiated it. The distinction between "tool" and "self" dissolves.
+
+See also: [[id:84a537b4-4256-50c8-91f5-dd5b4538418f][Verification appliance]], [[id:13e6ae54-2d24-5aa0-b1cd-a7e8e749aa70][Self-driving Lisp Machine]]