SHADES — rig it, then survive the night

Geometry/tower-defense: you're a small person rigging shade sails against Australian storms. three.js r175 (vendored, no build step) + a zero-dep Python server. Everything the repo needs is in the repo.

Run it

python3 server.py --port 8801     # any free port
# game:     http://localhost:8801/web/world/index.html
# selftest: http://localhost:8801/web/world/selftest.html   (must be all green)
# 2D proto: http://localhost:8801/prototype/index.html      (the original thesis)

No pip, no npm, no build. Python 3.8+ and a browser.

Read in this order

1. DESIGN.md — the design canon (what the game is)
2. PLAN3D.md — the build canon (stack, contracts, lane model)
3. THREADS.md — the append-only lane log. The project's memory. Read the last few [I] integrator entries to know the current state.
4. SPRINT12.md — the current sprint (highest-numbered SPRINTn.md wins)
5. LANE_PROMPTS.md — copy-paste prompts per lane, per sprint (bottom = newest)

The lane model (how this repo is built)

Five parallel Opus agents ("lanes"), each in its OWN clone, on its own branch:

lane	owns
A	main.js, world.js, camera, hud, week, sites, server — shell & integration, merge shepherd
B	sail.js, rigging — cloth sim, economy, balance.test pen
C	weather, skyfx, debris, storm/site wind data
D	player, interact, ladder, broom — and the designated playtester
E	Blender asset factory (tools/blender), models/, textures

Hard rules (they exist because each was earned — see THREADS):

• One clone per lane. Never two agents in one working tree.
• Rebase onto latest main before starting; small commits; push your branch.
• File ownership is the merge strategy; cross-lane needs go in THREADS.md.
• Selftest green after every landing. Skips must be real. An assert that cannot fail is decoration.
• All sim code is deterministic (dt, t) — no Date.now, no rAF.
• Measure, don't reason: the repo's biggest bugs were all "a number gathered from the wrong harness". When two harnesses disagree, find the variable.

Setup on a new machine

Gitea's SSH runs over tailscale (the public host is Cloudflare-proxied, no direct SSH). Add to ~/.ssh/config:

Host gitea.partly.party
    HostName 100.71.119.27
    Port 222
    User git

Then:

git clone git@gitea.partly.party:monster/shades.git ~/Documents/shades
for L in A B C D E; do
  git clone git@gitea.partly.party:monster/shades.git ~/Documents/shades-lane$L
  git -C ~/Documents/shades-lane$L checkout -B lane/$(echo $L | tr 'A-Z' 'a-z') origin/lane/$(echo $L | tr 'A-Z' 'a-z')
done

~/Documents/shades is the integration checkout (main; where merges and sprint docs happen). The five shades-lane* clones are where lane agents run.

Per clone, once: cp .claude/launch.example.json .claude/launch.json and pick a port of your own (integration 8823, lanes A–E 8824–8828). The real launch.json is untracked — six checkouts on one laptop can't share one port.

Sprint cycle

1. Fire lanes with the newest prompts at the bottom of LANE_PROMPTS.md (Lane A usually first if the sprint gives it rulings/blocking items).
2. Lanes work, push their branches, log in THREADS.md.
3. Integrate in the main checkout: merge origin/lane/{e,c,b,d} (THREADS.md conflicts resolve keep-both-chronological; real code conflicts get read), run selftest, play the result, write SPRINT(n+1).md + prompts, push main AND fast-forward all five lane/* branches to main.