docs: initial baseline — game design plan, workflow rules, env template

.env.example

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+CESIUM_ION_TOKEN=your-cesium-ion-token-here

.gitignore

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+# env — never commit secrets
+.env
+
+# deps
+node_modules/
+
+# build output
+.next/
+dist/
+test-results/
+*.tsbuildinfo
+
+# local data (DB + CSV cache) — keep folder marker
+data/*
+!data/.gitkeep

AGENTS.md

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+# Flight Simulator — Workflow Rules
+
+## Change process (mandatory)
+1. **Small, incremental changes** — work is done one change at a time, in smaller parts; each part must be tested thoroughly with unit and e2e tests covering it before moving on.
+2. **Changelog entry** — every such change is listed in `CHANGELOG.md` with date, time and version (format: `## v<version> — YYYY-MM-DD HH:MM`, then bullet points of what changed).
+3. **Version bump** — the version is updated in `package.json`.
+4. **Commit + tag** — a commit is created for each change, tagged with the version (e.g. `v0.1.0`).

PLAN.md

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+# Flight Ops — Game Design
+
+Browser game, pure economic gameplay: run a small airplane transport company in Europe.
+No manual flying — planes auto-fly assigned routes; you manage the business from an ops dashboard over a 2D map (lite 3D terrain if it stays lightweight).
+
+## Layout (single screen)
+- Left pane — Assets: fleet list (plane type, status, fuel, location), wallet, reputation
+- Right pane — Jobs & Market: contracts between airports (reward, deadline, cargo/passengers) with accept/dispatch actions; market actions (buy/sell planes, refuel, maintenance)
+- Middle — Map: EU airports as markers, animated plane positions along routes, active contract routes highlighted; click airport → info (runways, local time, weather); click plane → status
+
+## Core loop
+Accept job → dispatch a plane → watch it fly the route on the map → earn money + reputation → buy better planes / take bigger jobs.
+
+## Map & rendering
+- MapLibre GL JS with vector tiles (OpenFreeMap/OSM-based) — crisp detail down to ~10–100 m/px at city zoom, smooth continent overview; no Cesium needed
+- Lite 3D: terrain/hillshade from free DEM tiles if it stays lightweight, otherwise flat 2D
+- Game-logic data (airports, runways, countries/regions): downloaded CSV dataset cached in `data/`
+
+## Simulation engine
+- Server-authoritative state: sim ticks on the server, client polls and renders
+- Time scale 1x–60x + pause; sim clock persisted across sessions
+- SQLite via Drizzle ORM — schema designed to switch to Postgres later
+- Demand/revenue/cost formulas per contract leg; fuel burn by distance/plane type
+
+## Weather (display-only for now)
+- Generated per airport (wind, visibility/fog, conditions)
+- Shown on map / airport info; no gameplay effects yet
+
+## MVP slice
+Starter plane + EU airports + contracts + buy/sell + map visualization + weather display.
+
+## Later
+- Weather effects: delays, fuel burn changes, closed airports
+- More aircraft types, upgrades (fuel efficiency, cargo capacity) — money sinks
+- Multi-region packs (non-EU airports)
+- Multiplayer (shared world, contract races)