T-012: port the single-player client onto session + loopback

Odyssey: bound the living galaxy to 3 seed-drawn background worlds

Phase 5 (spectate): watch an AI-vs-AI match live, at 1x-8x

Phase 4 (part 2): the playable Gauntlet — play a real match, rate it, resume it

Add Observer Mode: a free-look spectator over the Odyssey galaxy

Persistent Antimatter Gate charge strip in the HUD

Starmap live colony ledger: alert badges + garrison line

HUD alerts + selection UX: minimap attack pings, base cycling, idle-production chip, Alt-subtract

Redesign panel collapsibility: per-category, and generalized to every long list

Make the Build submenu collapsible for Worker/Engineer/Technician (#30)

Formation shapes, leader positioning, and nested formations for grouped units

Tier 3 UX: pause, toast stack, control groups, hotkeys, touch & colour cues

Add Odyssey open-world mode (Phase 1): endless single-planet foundation

Refactor: split the main.js god-file into focused modules