feat: initial scaffold of unibus message bus (membership service + client lib + demo peers)

migrations/001_init.sql

@@ -0,0 +1,32 @@
+-- 001_init.sql — initial schema for the unibus membership/key-distribution service.
+-- Additive and idempotent: safe to apply repeatedly. Never modify this file;
+-- schema changes go in new numbered migrations (see .claude/rules/db_migrations.md).
+
+CREATE TABLE IF NOT EXISTS rooms (
+  room_id        TEXT PRIMARY KEY,
+  subject        TEXT NOT NULL,
+  key_epoch      INTEGER NOT NULL DEFAULT 1,
+  encrypt        INTEGER NOT NULL,
+  persist        INTEGER NOT NULL,
+  sign_msgs      INTEGER NOT NULL,
+  owner_endpoint TEXT NOT NULL,
+  created_at     TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS members (
+  room_id   TEXT NOT NULL,
+  endpoint  TEXT NOT NULL,
+  role      TEXT NOT NULL,
+  joined_at TEXT NOT NULL,
+  sign_pub  BLOB NOT NULL,
+  kex_pub   BLOB NOT NULL,
+  PRIMARY KEY (room_id, endpoint)
+);
+
+CREATE TABLE IF NOT EXISTS room_keys (
+  room_id    TEXT NOT NULL,
+  epoch      INTEGER NOT NULL,
+  endpoint   TEXT NOT NULL,
+  sealed_key BLOB NOT NULL,
+  PRIMARY KEY (room_id, epoch, endpoint)
+);