Initial brainstorm record: linking Pod Bays across the internet

- README: project charter + seed concept (per-site 10.0.y.0/24 subnets,
  VPN into one /16, merged siteconfigs -> master console)
- docs/PODBAY-ECOSYSTEM: survey of the existing bay stack with source
  pointers (TeslaSuite RPC 53290, Firestorm DirectPlay 4 + CTCL, BT411
  console/egg protocol, RP Munga 1501, PQS, port map)
- docs/BRAINSTORM: addressing plan, routed-L3 vs bridged-L2 analysis,
  master console vs federation, per-game linking, shared services,
  security posture, open questions, phased roadmap
- sites/: site-ID / subnet registry (public info only)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

sites/README.md

@@ -0,0 +1,13 @@
+# Site registry
+
+One file per site: `NN-shortname.md` where `NN` is the site ID (third octet of the
+site's `10.0.NN.0/24` subnet). IDs are allocated here, first-come, by PR/commit.
+
+**Public info only** — subnet, operator, contact, WireGuard *public* key and endpoint
+hostname. Siteconfigs (pod keys) and WireGuard private keys never go in this repo.
+
+| ID | Subnet | Site | Status |
+|----|--------|------|--------|
+| 0 | 10.0.0.0/24 | (reserved) shared infrastructure — hub, master console, PQS, Mumble, NTP, dedicated host | reserved |
+| 1 | 10.0.1.0/24 | Fallout Shelter Arcade | allocated |
+| 2 | 10.0.2.0/24 | (next site) | open |