Promote entire passepartout-economics/ to ideas/ root

All 31 files from ideas/passepartout-economics/ promoted to ideas/ root.
- Subfolder's passepartout-economics.org (42-line index) renamed to
  triad-index.org to avoid collision with root-level full doc
- index.org removed (redundant — triad-index.org replaces it)
- Root-level passepartout-economics.org: stripped file:passepartout-economics/
  prefix from all cross-references (now simple file:foo.org links)
- compliance-framework-mapping.org: same prefix cleanup
- All internal file: links within the economics docs already used simple
  names (no prefix) — they resolve correctly from ideas/ root

ideas/pds-as-a-service.org

@@ -0,0 +1,18 @@
+:PROPERTIES:
+:ID:       1a2b38df-20ba-58ca-ba55-a072be67bd0d
+:END:
+#+title: Personal Data Store as a Service
+#+filetags: :passepartout:agora:revenue:pds:saas:
+
+Classic open-core SaaS model (GitLab, Sentry, PlanetScale). The Merkle fact store exposed on Agora can be self-hosted (free, AGPL) or hosted by the early player.
+
+- **Free tier (self-hosted):** full AGPL PDS, runs on any Lisp host, full control, no cost
+- **Basic hosted tier:** $10-$20/month, 10GB fact store, 10M queries/month, automated backup, automatic upgrades
+- **Business hosted tier:** $100-$500/month, 100GB+ fact store, unlimited queries, SLA, dedicated relay, compliance logging
+- **Enterprise hosted tier:** $1,000-$10,000/month, air-gapped appliance management, dedicated support, regulatory-compliant data residency, SIEM integration
+
+The free self-hosted version drives adoption and trust (you can inspect every line). The hosted version captures value from users who value convenience over control. Bluesky already demonstrated demand at ~$10/month for a simpler PDS.
+
+Target: 100K subscribers at $15/month average = $18M/yr recurring, near-zero marginal cost per additional subscriber (the symbolic engine is CPU-bound, not per-user metered).
+
+Combined with [[file:agora-usernames.org][premium usernames]]: $28M/yr from Agora services alone before compute marketplace revenue. The hosted model also creates [[file:infrastructure-lock-in.org][infrastructure lock-in]] as users build their Merkle fact stores on the platform, making migration costly. The AGPL licensing model is described in [[file:licensing.org][Licensing]].