0.0.3 — Portal & Flowfield Pathfinding

Features

• Hierarchical Flow Field Pathfinding ported from OpenAge
• Unit Training Queue with progress bar and cancel
• Building Deselection � new selection clears previous
• Tree Density Grid for fast AI queries
• AI GOAP Rework

Fixes

• Chopper slot overlap eliminated
• Unit spawn at building bottom corner
• Water level raised to shoreline
• Production stalls gracefully

Performance

• 65K bitmap ? ~20-entry HashSet
• Dirty tile tracking instead of full-map diff
• Production FFI skipped when idle
• Portal rebuild skipped for interior tiles
• Steering radius reduced