agricogla: add self-contained symbolic-planner Coworld player

[devin-ai-integration]

Summary

Adds players/agricogla/symbolic-planner/ — a self-contained fork of the in-tree planner player from metta/packages/cogweb/games/agricogla, so the agricogla planner lives in this repo as a canonical, uploadable player and can compete on the league as its own player, independent of the metta source.

The point of the fork is dependency isolation: the metta player imports @cogweb/* workspace packages, which don't exist here. This leaf instead carries its own verbatim copy of the game engine (src/engine/) and planner (src/planner/) plus a minimal cogweb.player.v1 websocket runtime (src/runtime/player-runtime.ts), so it builds and runs entirely from this directory with no metta checkout.

What the policy does (unchanged from the source): deterministic, no-LLM. For each legal move it determinizes hidden state and rolls the game out to round 14 under a baseline continuation, then argmaxes terminal score margin (one-step policy improvement). The determinization is what keeps it from crashing on the host's redacted view — opponent hands + the undealt deck arrive as the "hidden" sentinel, and a naive rollout that reads them throws unknown card: hidden.

Packaging conforms to docs/coworld-player-packaging.md: build.sh sources tools/players_build/build_lib.sh and sets the player metadata, so it produces the linux/amd64 image, the player[] snippet on stdout, and dist/coplayer_manifest.json.

players/agricogla/symbolic-planner/build.sh
# -> players-agricogla-symbolic-planner:dev  + player[] snippet + coplayer_manifest.json

Verification

• npm run typecheck — clean.
• npm run smoke (smoke.ts) — full 4-player, 14-round episode with the planner piloting seat 0 over redacted views (exact host masking), no crash; planner wins/ties.
• build.sh — builds the linux/amd64 image and emits both manifest artifacts.

Notes

• node_modules/, dist/, and package-lock.json are git-ignored; the image bundles everything via esbuild so the runtime layer is just planner-player.js.
• Derived from the in-tree player added in Metta-AI/metta#16417.

Link to Devin session: https://app.devin.ai/sessions/f7ff86c598a747539827d0f4e34ea79f
Requested by: @aaln

[devin-ai-integration]

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