feat: balance checks and README - v1 complete

README.md

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+# Probability
+
+A neon space-trading sim where unobserved ships are probability waves.
+
+Inspired by Space Rangers. Every NPC trader plans real routes and real trades,
+but between observations its position is a probability cloud smeared along the
+jump lanes — and so is your knowledge of every market more than a news-day away.
+Observation collapses the cloud: enter a system and ships condense out of the
+static; dock at a planet and its prices become real.
+
+Under the hood the universe is deterministic ("hidden variables" drawn lazily
+from per-ship seeds) — the probability is *yours*, not the universe's.
+
+## Run
+
+    npm install
+    npm run dev        # play at http://localhost:5173 (add ?seed=anything for a new galaxy)
+    npm test           # headless sim test suite
+
+## How to play
+
+- You start docked. Buy what a planet produces cheap, sell where it's consumed.
+- Sidebar: navigation, market (when docked), cargo, intel, log. Space = pause,
+  Tab = map/system view. Click planets/gates/systems to move; click systems on
+  the map for price intel — note the age tag, old news lies.
+- Lanes are tinted by pirate danger. Dangerous shortcuts are profitable until
+  they aren't.
+- Orange smears on the map are ships you've met: where they probably are now.
+- Reach 100,000 credits to win. Lose your ship and it's over.