…ntPlayer.Polyglot#14

snake_solver.pg ports SnakeEnv (dynamics + 177-dim observation + action mask incl. the
anti-self-trap flood-fill shield) over flat Lists (body head-at-end, occupancy bool-list,
BFS via list+cursor — no HashSet/LinkedList/Queue), plus PgDuelingNet + a masked-greedy
chooseAction. It type-checks and generates correct C#/TS individually.

BLOCKED from building alongside FruitCake by MintPlayer.Polyglot#14: with a 2nd .pg each
transpiled .cs re-emits the prelude (Option/Some/None) → CS0101. Parked via PolyglotFile
Remove so the branch stays green; delete the Remove + continue (facade/tests/director) once
the prelude is deduped upstream. Env build green with Snake excluded.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…longside FruitCake

Bump 0.3.0->0.3.1 (shared __polyglot_prelude.cs + partial PolyglotProgram fix #14), drop
the PolyglotFile Remove workaround. Fixes to snake_solver.pg: rename PgDuelingNet->PgSnakeNet
(distinct name; a deliberate copy of FruitCake's net — one assembly, so a shared name would
clash; a shared nn.pg is a future refactor), and rename a fill-loop var to avoid a C# i-scope
clash (CS0136). Environments builds with both .pg; 22 FruitCake/Polyglot tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

… (SN1-SN3)

Rewrite the C# SnakeEnv to delegate to the transpiled PgSnakeEnv (dynamics + 177-dim
observation + action mask incl. the flood-fill shield now live once in snake_solver.pg,
shared with the browser's generated snake_solver.ts). The facade re-adds host concerns:
IEnvironment/IStatefulEnvironment API, the food RNG (Xoshiro, kept out of the single
source via the core's needsFood signal so determinism holds), the head-first Body/state
format, and the throw-on-illegal-action contract. Also commit the generated snake_solver.ts.

All 9 SnakeEnvTests green (dynamics, tail-follow occupancy sync, eating/wall/mask/throw,
same-seed obs, save/restore round-trip); Occupied() helper updated to read the core's
occupancy list. Full solution builds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

… retire server

SN4: ship the 177-dim net as ClientApp/public/snake-net.ckpt (LFS) + snake-net.ts parser
(builds PgSnakeNet from the dueling-q checkpoint).
SN5: SnakeDirector runs the whole AI in the browser — PgSnakeEnv dynamics + the flood-fill
action mask + masked-greedy chooseAction over the loaded net, on a discrete tick. Rewire the
Snake component's watch mode to it (drop the WebSocket/SnakeApi); both modes now run in-browser.
SN6: delete SnakeController, SnakeModelService (+ Program.cs regs), snake-api.ts, the stale
models/snake.dqn.ckpt, and SnakeApiTests (server WS/status path). EpisodeStreamer kept
(MountainCar still uses it). Web builds; 32 Snake/FruitCake/Polyglot tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…ny TS7022)

The BFS queue (List<i32> whose pushed values derive from reading the same list) transpiled
to an untyped `let queue = []` with circular element inference -> TS7022 in the browser
build. Rewrite reachableFreeSpace as iterative relaxation over the `seen` bool-list
(BFS-equivalent; values come from a fixed 0..cells range, never a list read). Snake grids
are small so O(cells^2) is fine. C# + TS regen; 9 SnakeEnvTests green (obs/mask unchanged).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Snake ships fully client-side (branch snake-clientside-ai): env+obs+mask+net single-sourced
in snake_solver.pg, C# SnakeEnv facade, browser director, server path retired. Verified in
browser (AI ate 40 / length ~35, 0 console errors, 0 /api/snake calls). MountainCar remains
(now uniform-Polyglot since 0.3.0 added cos/tanh).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…lot, retire server

mountaincar_solver.pg single-sources the classic-control dynamics (cos), the normalised
2-dim observation, and the PPO policy forward (PgMlpNet: Linear+Tanh hidden, linear output,
argmax) — cos/tanh now available in Polyglot 0.3.0+ (sub-ULP C#<->TS drift is harmless: no
server twin, argmax decision; C# stays exact via Math.Cos). C# MountainCarEnv is a facade
over PgMountainCarEnv (6 MountainCarEnvTests green, incl. the Gymnasium golden dynamics).

Browser: ship models/mountaincar.ppo.ckpt -> public/mountaincar-net.ckpt (LFS) + a mlp
.ckpt parser (mountaincar-net.ts -> PgMlpNet) + MountainCarDirector; rewire the watch mode
off the WebSocket. Retire the server path: MountainCarController, MountainCarModelService
(+ Program.cs regs), mountaincar-api.ts, stale net, MountainCarApiTests, and EpisodeStreamer
(now unused). Removed app.UseWebSockets() — no server WS remains (all games client-side).
Web builds; 38 env/Polyglot tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…ainCar)

Both remaining WebSocket-AI games now run entirely in the browser; no server WebSocket
remains anywhere (EpisodeStreamer + UseWebSockets removed). Verified in-browser (Snake
ate 40; MountainCar reaches the flag). PRD status -> IMPLEMENTED; PLAN M33 both games done.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>