feat(@projects/@magic-civilization): ✨ add proof scene rehydrating GDScript via GdPlayerApi dump_state_json
Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>
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.project/objectives/p2-72-option-b-workaround.md
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---
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id: p2-72-option-b
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title: "Option B render bridge — proof scene rehydrates GDScript from GdPlayerApi each turn"
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priority: p2
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status: open
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scope: game1
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category: tooling
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owner: simulator-infra
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created: 2026-05-12
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updated_at: 2026-05-12
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blocked_by: []
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follow_ups: [p2-67]
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---
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## Context
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`p2-72a` (canonical render source) revealed itself as a 10-14+ week architectural project. The user pivoted to Option B for the immediate Phase 13 screenshot deliverable — a proof scene that bypasses the full extraction by rehydrating GDScript-side entities from `GdPlayerApi.dump_state_json` each turn.
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The wire-transcript Claude-vs-AI demo is already shipped (mocked + real apricot 25-turn). This objective adds the rendered visual layer.
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## Locked decision
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**Option B (explicitly user-authorised, not silent fallback).** Accept dual-state drift for the demo path specifically. The Claude API path holds its own state via `GdPlayerApi`; the rendered path is a separate GDScript scene that pulls `dump_state_json` after every action and rebuilds local `PlayerScript`/`CityScript`/`UnitScript`/`GameMap` instances from the dump. Renderers see real game state without depending on the canonical-render-source milestone.
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The full extraction stays as `p2-72a` for whenever there's appetite to commit weeks to it.
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## Surface
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### 1. New proof scene
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`src/game/engine/scenes/tests/claude_vs_ai_render_proof.gd` + `.tscn`:
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- Boots `GdPlayerApi` in-process (same harness pattern as `claude_player_main.gd`).
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- Each turn:
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1. Calls `GdPlayerApi.dump_state_json()` (or equivalent — check existing accessor surface; if absent, add it as a thin wrapper around `GdGameState::serialize_full`).
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2. Parses the JSON into the existing GDScript `GameState.deserialize()` pathway, OR a new lightweight `_rehydrate_from_api_dump(json)` helper that constructs `PlayerScript`/`CityScript`/`UnitScript`/`GameMap` instances directly.
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3. Triggers a render refresh (existing renderers read from `GameState.players[*]` etc. just like they do today).
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4. Captures screenshot via `tools/screenshot.sh` pattern.
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5. Drives `EndTurn` via `GdPlayerApi.apply_action_json`.
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6. Repeat for 25 turns or game-end.
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### 2. `GdPlayerApi.dump_state_json` accessor
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If not already present, add it as a thin wrapper around the inner GameState's serde. Mirror shape of the `claude_player_main.gd` wire format if relevant.
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### 3. Claude policy
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Reuse the deterministic policy from `mc-player-api/tests/full_game_transcript.rs` (`pick_claude_action`). Read legal_actions from PlayerView (now available post-p2-67-followup-legal-actions). Found city → queue warrior → fortify → end turn.
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### 4. Screenshot output
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`.local/demo-runs/2026-05-12-phase13-screenshots/` directory:
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- `turn-00.png` through `turn-25.png` (every 5 turns at minimum, ideally every turn).
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- `recap.md` with per-turn action log (Claude's choice + AI activity + score deltas).
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- `transcript.jsonl` (the canonical wire log, same shape as the real-apricot demo).
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### 5. Dual-state acknowledgement
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Document explicitly in the proof scene's docstring:
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- `GdPlayerApi` is the source of truth for state.
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- GDScript `GameState.players[*]` etc. is a per-turn rehydrated VIEW, never authoritative.
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- DO NOT mutate the GDScript side directly in this proof — all mutations go through `GdPlayerApi.apply_action_json`.
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- This proof's render path is NOT the production game's render path; it's a Phase-13 deliverable workaround.
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## Acceptance
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- ☐ `src/game/engine/scenes/tests/claude_vs_ai_render_proof.gd` + `.tscn` exist.
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- ☐ Drives a 25-turn Claude-vs-AI game on apricot via flatpak Godot headless.
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- ☐ Captures 6 screenshots minimum (turns 0, 5, 10, 15, 20, 25).
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- ☐ Recap markdown with per-turn action log.
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- ☐ Transcript JSONL alongside screenshots.
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- ☐ Screenshots show real game state evolution (cities appear, units move, scores change).
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- ☐ Determinism: same seed → byte-identical transcript + per-screenshot hash.
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- ☐ p2-67 Phase 13 closes.
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## Why this size
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- Proof scene scaffold: ~2 hr.
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- Rehydration helper: ~2 hr (parses dump, constructs GDScript classes — borrows logic from existing `GameState.deserialize`).
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- Claude policy: 30 min (port from `full_game_transcript.rs`).
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- Screenshot capture: 30 min (`tools/screenshot.sh` already exists).
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- 25-turn drive + verification: 1-2 hr.
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**Total: ~0.5-1 day.**
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## Unblocks
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- `p2-67` Phase 13 (real screenshots of Claude vs AI gameplay).
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- Closes the wire-transcript-only gap in the demo deliverable.
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## Tech debt acknowledged
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- Dual state in the proof path (GDScript view rebuilt per turn from Rust source of truth).
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- Renderers cannot be reused in this exact form for any other Claude-driven scene without similar rehydration boilerplate.
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- These are accepted for the demo; the full fix is `p2-72a`.
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## References
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- `.project/objectives/p2-72-gdplayerapi-render-bridge.md` — original p2-72 with Option A vs B framing.
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- `.project/objectives/p2-72a-gdgamestate-canonical-render-source.md` — the full extraction (deferred).
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- `src/simulator/crates/mc-player-api/tests/full_game_transcript.rs` — Claude policy + wire format reference.
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- `src/game/engine/scenes/headless/claude_player_main.gd` — `GdPlayerApi` harness pattern.
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- `tools/screenshot.sh` — capture pipeline.
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- `.local/demo-runs/2026-05-12-real-apricot-claude-vs-ai/` — wire transcript precedent.
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---
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id: p2-72b-promote-playerstate-cities-to-city
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title: "Promote PlayerState.cities from Vec<CityState> → Vec<City>"
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title: "Parallel-field cities synthesis at Godot bridge (Option C)"
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priority: p2
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status: open
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status: blocked
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scope: game1
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category: architecture
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owner: simulator-infra
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created: 2026-05-12
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updated_at: 2026-05-12
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blocked_by: []
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blocked_by: [user-decision-three-resolutions]
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follow_ups: [p2-72a, p2-72, p2-67]
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---
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## STATUS — 2026-05-12 (Hard Stop #1, Section 1 audit)
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**Status flipped `open` → `blocked` before any code changes.** Option C as
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specified cannot land as written because the per-instance `GdCity`
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architecture invalidates the implicit "small presentation field set"
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premise the spec relies on. User decision required between three
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resolution paths (below) before this objective can proceed.
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### What the audit found
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The Option C spec implicitly assumed `CityScript` already proxies field
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reads through `GdGameState` (mirroring the `BuildingScript` thin-view
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pattern from commit `08cc82b70`, p2-72a Stage 2b). The actual
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architecture is materially different:
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- `src/game/engine/src/entities/city.gd:95-105` — every `CityScript`
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instance constructs **its own** per-instance `GdCity` GDExtension via
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`ClassDB.instantiate("GdCity")`. The Godot bridge wrapping that
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instance is `src/game/engine/src/entities/city_rust_bridge.gd`. The
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560-line `city.gd` is **not** a thin view today; it's a fat wrapper
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around `GdCity` calls.
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- `src/simulator/api-gdext/src/lib.rs:1472-1478` — `GdCity` holds
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`inner: mc_city::City` plus a `mc_city::ItemRegistry`. That's the
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**full** `mc_city::City` type (~30 fields incl. queues, worked tiles,
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item production), not `CityState`.
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- `src/simulator/crates/mc-turn/src/lib.rs` + `mc-city/src/lib.rs` —
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`PlayerState.cities[ci]` is `mc_city::CityState` (the 9-field bench
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struct). It is structurally disjoint from the per-instance `GdCity`'s
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`mc_city::City`.
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- `src/simulator/api-gdext/src/lib.rs:3640` — the only `GdGameState`
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city accessor today is `city_count(pi)`. No `city_dict`, no per-city
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field accessors. Confirms renderers do **not** read cities through
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`GdGameState` today; they read through `CityScript._bridge._gd_city`.
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### Field set the renderer actually needs
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Walking `city.gd` accessors and `to_save_dict` / `to_json` exit points,
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the readable surface is ~30 fields, several of which are themselves
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containers. Current home of each:
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**On `CityState` (bench, lives in `PlayerState.cities[ci]`):**
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`population`, `food_stored`, `production_stored`, `queue`, `queue_cost`,
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`queue_tier`, `food_yield`, `prod_yield`, `worker_expertise`.
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**On `mc_city::City` (held by per-instance `GdCity`):**
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`city_name`, `position`, `is_capital`, `turn_founded`, `buildings`,
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`placed_buildings`, `culture_stored`, `culture_expansion_threshold`,
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`growth_threshold`, `focus`, `owned_tiles`, `worked_tiles`, `hp`,
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`max_hp`, `is_destroyed`, `can_expand`, per-building queues
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(`queue_snapshot`, `queue_len`), item registry/production
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(`load_items_json`, `tick_building`, `enqueue_item`), per-turn
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processors (`process_growth`, `process_culture`,
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`process_culture_with_modifier`, `heal_per_turn`, `mark_attacked`),
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yields/food-surplus (`get_yields`, `get_food_surplus`), citizen
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management (`auto_assign_citizens`, `assign_citizen`,
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`unassign_citizen`), border expansion (`expand_borders`), defense
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(`take_damage`, `heal`).
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**GDScript-only (lives on `CityScript`):**
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`original_capital_owner`, `production_queue`, `production_progress`,
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`has_bombarded`, `bombard_range`, `is_capital` (script-side mirror).
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### Why this trips Hard Stop #1
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The task spec's hard stop reads: *"A renderer reads a city field that's
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neither in CityState nor easily added to CityPresentation → STOP,
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document, exit."*
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"Easily added to CityPresentation" reasonably caps at the 8-field
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example in the spec (`city_name`, `position`, `focus`, `owned_tiles`,
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`buildings`, `culture_stored`, `hp`, `max_hp`). The actual field set is
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~3× that, includes containers, and includes mutation-heavy methods
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(`process_growth`, `tick_building`, `enqueue_item`, `take_damage`,
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`assign_citizen`) that aren't presentation reads at all — they're
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domain methods the renderer's wrapping entity invokes. Re-homing those
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through `GdGameState.city_dict` would require porting their behaviour
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to operate over `GdGameState.inner.players[pi].cities[ci]` — but that
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slot is `CityState` and doesn't carry the state these methods mutate.
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The same trap p2-72a Stage 4 documented at line 181 of
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`p2-72a-gdgamestate-canonical-render-source.md` (*"a faked `city_dict`
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that reads from GDScript-side state would defeat the view-conversion
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premise"*) fires here.
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### Three resolution paths (user decision required)
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1. **Balloon `CityPresentation` to ~30 fields, duplicating most of
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`mc_city::City` into a UI-layer struct on `GdGameState`.** Lands
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Option C as locked, but the "lightweight bridge slot" framing is
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gone — the parallel slot is now structurally equivalent to a second
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copy of `mc_city::City` with no behavioural methods. Save-format and
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sync-invariant complexity scale with the field count. The domain
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methods (`process_growth`, `take_damage`, etc.) still need a home;
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one option is to leave them on per-instance `GdCity` and proxy
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reads only through `presentation_cities`, which produces a
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three-way state split (CityState + presentation + per-instance
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GdCity) that's strictly worse than today's two-way split.
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2. **Hold `Vec<Vec<GdCity>>` (or `Vec<Vec<mc_city::City>>`) on
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`GdGameState` as the parallel slot.** Cleanest architecturally —
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one canonical `mc_city::City` per (player, city) lives on the
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shared `GdGameState`, per-instance `GdCity` instantiation in
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`city.gd:95-105` gets deleted, `CityScript` becomes a thin view
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over `_gd_state.city_dict(pi, ci)`. This is structurally Option A
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(promote `PlayerState.cities` to `City`) applied at the bridge
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layer — the bench `CityState` stays in `PlayerState.cities` for
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MCTS/AI/turn-processor parity, and the full `City` lives parallel
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on `GdGameState`. Effort: ~5-7 days (matches the original Option A
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estimate); fully unblocks Stage 4 Wave 2b. **Different decision
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than the locked Option C — needs user re-lock.**
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3. **Keep per-instance `GdCity`; add `city_dict` on `GdGameState`
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only for the 8 presentation fields the AI/replay/save layer
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already needs (city_name, position, focus, owned_tiles, buildings,
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culture_stored, hp, max_hp), and DO NOT collapse `CityScript` to
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a thin view in this objective.** Partial unblock. p2-72a Stage 4
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Wave 2b checkbox does **not** flip — `CityScript` view conversion
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stays deferred, gets its own follow-up objective. Lowest-effort
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path (~1 day), preserves bench parity, but does not deliver the
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advertised acceptance bullet "CityScript view conversion landed".
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### Evidence
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- `src/game/engine/src/entities/city.gd:95-105` — per-`CityScript`
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`ClassDB.instantiate("GdCity")` site.
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- `src/game/engine/src/entities/city_rust_bridge.gd:1-50` — bridge
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wrapping per-instance `GdCity`.
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- `src/simulator/api-gdext/src/lib.rs:1472-1478` — `GdCity::init`
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body, `inner: mc_city::City`.
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- `src/simulator/api-gdext/src/lib.rs:3640-3644` — sole `GdGameState`
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city accessor today (`city_count`).
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- `src/simulator/api-gdext/src/lib.rs:3512-3516, 3721-3737` — only
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two `PlayerState { ... }` literal sites (spec called out 4; lines
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3836-3858 are the `set_player_cities_from_array` setter, not a
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constructor).
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- `.project/objectives/p2-72a-gdgamestate-canonical-render-source.md:177-184`
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— original hard-stop record from Stage 4 Wave 2b that spawned this
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objective.
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### Recommendation
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Path 2 (`Vec<Vec<mc_city::City>>` on `GdGameState`) is the only
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resolution that actually delivers the locked acceptance bullet
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"CityScript view conversion landed". It costs more than the original
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2-3 day Option C estimate (~5-7 days) but cleanly retires the
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per-instance `GdCity` instantiation pattern and lets `CityScript`
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collapse to the same shape as `BuildingScript`. Path 1 trades effort
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for architectural debt; Path 3 narrows scope but punts the actual
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Stage 4 Wave 2b unblock to another objective. User pick.
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---
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## Context
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`p2-72a Stage 4 Wave 2b` (CityScript view conversion) blocked here. `mc_turn::PlayerState.cities` is `Vec<mc_city::CityState>` — the minimal bench struct with 9 fields (population, food_stored, production_stored, queue, queue_cost, queue_tier, food_yield, prod_yield, worker_expertise). Every public CityScript field the GDScript renderers read lives on `mc_city::City` — the full type at `mc-city/src/city.rs:234` with `city_name`, `position`, `buildings`, `placed_buildings`, `culture_stored`, `focus`, `owned_tiles`, `worked_tiles`, `hp`/`max_hp`, per-building queues, etc.
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The two types are deliberately decoupled per the comment at `mc-city/src/lib.rs:105-108`. To make CityScript a thin view, the held type must carry every field renderers consume.
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## Locked decision
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## Locked decision (revised 2026-05-12 after audit)
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**Promote, don't widen.** Change `PlayerState.cities: Vec<CityState>` → `Vec<City>`. The full type already exists and is exercised by the production game via `GdCity` instances; promoting consolidates around one canonical city representation. Widening `CityState` would create a second drift point.
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**Option C — parallel-field synthesis at Godot bridge layer only.**
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Where `CityState` is genuinely the right minimal struct for some pure-sim subsystem (bench MCTS rollouts?), document the call site and keep a separate `Vec<CityState>` for that path. Don't drop `CityState` entirely.
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The original spec's "promote" premise was empirically false: `mc_city::City` is NOT a superset of `CityState`. They're structurally divergent — `food_stored: i32` vs `f64`, no `food_yield`/`prod_yield`/`queue`/`queue_cost`/`queue_tier`/`worker_expertise` on `City`, completely different queue model (`BTreeMap<String, BuildingQueue>` vs `Option<Queueable>`). The bench `TurnProcessor` + 4 bench bins + 10 test fixtures = ~150 access sites depend on `CityState` fields.
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Promoting (Option A: rename + parallel + sync contract) would be a 5-7 day project; full port (Option B) would be 2+ weeks and regress bench/MCTS parity. Both exceed the original 2-3 day budget AND aren't the path to unblock Stage 4 Wave 2b.
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Option C scope:
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- Keep `mc-turn::PlayerState.cities: Vec<CityState>` unchanged.
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- The Godot bridge (`api-gdext::GdGameState`) holds a parallel synthesised view: `presentation_cities: Vec<CityPresentation>` (or equivalent) populated by GDScript hand-off + maintained by `GdGameState` bridge mutators.
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- `city_dict(player_idx, city_idx)` returns the bench `CityState` fields PLUS the presentation fields the renderers consume (city_name, owned_tiles, focus, buildings).
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- The full `mc_city::City` consolidation stays as a future strategic objective.
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This is the smallest correct change that unblocks `p2-72a` Stage 4 Wave 2b without grinding through architectural canonicalisation that doesn't belong in p2-72b's scope.
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## Surface
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