Initial scaffold: Turborepo monorepo + design wiki

Turborepo (pnpm workspaces) with all dependencies pinned to latest
mutually-compatible versions: turbo 2.9, TypeScript 6, Fastify 5,
React 19, Vite 8, better-sqlite3 12 + Drizzle ORM 0.45.

Layout:
- apps/server   Fastify backend (local JWT auth + role guard, /health)
- apps/web      React 19 + Vite 8 operator SPA
- packages/db   Drizzle schema on SQLite/WAL; append-only events + users
- packages/devices  reader/printer/relay adapter interfaces (intent-only relay)
- packages/shared   shared domain types

Architecture constraints from the design wiki are encoded in the scaffold:
append-only hash-chained + signed event log, device-agnostic adapters,
"a barrier is not a door" (relay expresses intent only), fully-local
offline-first auth.

wiki/ is an LLM-maintained Obsidian knowledge base (28 pages) ingested
from the architecture & design notes, with its own maintenance schema.

Verified: pnpm install, full turbo build (5/5), server boots and serves
/health, drizzle-kit generates the initial migration.

wiki/concepts/event-log-ingestion.md

@@ -0,0 +1,26 @@
+---
+type: concept
+tags: [parking, security, access-control, integrity]
+sources: [parking-system-architecture]
+updated: 2026-06-14
+---
+
+# Event-Log Ingestion (making the UHPPOTE log trustworthy)
+
+The host-side discipline that turns the [[uhppote-controller]]'s log — undermined by the
+[[uhppote-udp-protocol]] — into a solid detection/audit layer. (See
+[[parking-system-architecture]] §6.)
+
+- **Track your own last-ingested index on the host.** Do **not** rely on the controller's
+  current-index pointer — it's user-managed and settable by anyone (`set-event-index`).
+- Walk **absolute** indices with `get-event <id>`. Treat three things as **alarms**:
+  1. a **gap** in the sequence,
+  2. an **"event has been overwritten" error** (you fell behind — data loss),
+  3. any **door-open event the host never requested**.
+- Use `set-listener` **auto-push** for low latency, but **always reconcile by index** (UDP
+  pushes can drop).
+- **Size polling cadence** against the busiest lane's event rate so unread events never roll off.
+- **Land every event** in the host's signed [[append-only-event-chain]].
+
+Net result: **tamper-evident, behind [[network-isolation]]** — a solid detection layer, but not
+tamper-proof. Prevention requires the [[esp32-custom-controller]].