Add ARCHITECURE.md and cursor rule for it

Author: yanfengliu

.cursor/rules/update-architecture.mdc

@@ -0,0 +1,5 @@
+---
+alwaysApply: true
+---
+- Before you do anything, check `ARCHITECTURE.md` for the file structure.
+- Keep `ARCHITECTURE.md` updated to reflect the latest file structure structure.

.cursor/rules/update-progress.mdc

@@ -3,5 +3,5 @@ description: Always keep progress updated
 alwaysApply: true
 ---
 - Before you do anything, check `PROGRESS.md` for what is already done.
-- After you do anything, update `PROGRESS.md` afterwards to keep track of what is done. Keep the wording simple. Skip test related progress.
+- After you do anything, update `PROGRESS.md` afterwards to keep track of what is done. Keep the wording simple. Skip test related progress and redundant items.
 - This serves as long-term context.

ARCHITECTURE.md

@@ -0,0 +1,77 @@
+python_mini_metro/
+|- .cursor/
+|  |- rules/
+|  |  |- run-tests-after-changes.mdc
+|  |  |- update-architecture.mdc
+|  |  |- update-game-rules.mdc
+|  |  \- update-progress.mdc
+|- .github/
+|  \- workflows/
+|     \- test.yml
+|- src/
+|  |- agent_play.py
+|  |- config.py
+|  |- env.py
+|  |- main.py
+|  |- mediator.py
+|  |- travel_plan.py
+|  |- type.py
+|  |- utils.py
+|  |- entity/
+|  |  |- get_entity.py
+|  |  |- holder.py
+|  |  |- metro.py
+|  |  |- padding_segment.py
+|  |  |- passenger.py
+|  |  |- path.py
+|  |  |- path_segment.py
+|  |  |- segment.py
+|  |  \- station.py
+|  |- event/
+|  |  |- convert.py
+|  |  |- event.py
+|  |  |- keyboard.py
+|  |  |- mouse.py
+|  |  \- type.py
+|  |- geometry/
+|  |  |- circle.py
+|  |  |- cross.py
+|  |  |- diamond.py
+|  |  |- line.py
+|  |  |- pentagon.py
+|  |  |- point.py
+|  |  |- polygon.py
+|  |  |- rect.py
+|  |  |- shape.py
+|  |  |- star.py
+|  |  |- triangle.py
+|  |  |- type.py
+|  |  \- utils.py
+|  |- graph/
+|  |  |- graph_algo.py
+|  |  \- node.py
+|  \- ui/
+|     |- button.py
+|     |- path_button.py
+|     \- viewport.py
+|- test/
+|  |- test_agent_play.py
+|  |- test_coverage_utils.py
+|  |- test_env.py
+|  |- test_gameplay.py
+|  |- test_geometry.py
+|  |- test_graph.py
+|  |- test_main.py
+|  |- test_mediator.py
+|  |- test_path.py
+|  |- test_station.py
+|  \- test_viewport.py
+|- .gitignore
+|- .pre-commit-config.yaml
+|- ARCHITECTURE.md
+|- environment.yml
+|- GAME_RULES.md
+|- PROGRESS.md
+|- pyproject.toml
+|- README.md
+\- requirements.txt

PROGRESS.md

@@ -37,3 +37,4 @@
 - Updated `GAME_RULES.md` line/station progression and passenger spawning timing details to match current implementation.
 - Added rare one-of-a-kind station shapes (diamond, pentagon, star) and shape rendering support.
 - Added station-pool generation logic so unique shapes can only appear after the 10th station slot and at most once each per run.
+- Updated `ARCHITECTURE.md` to reflect the latest project file structure.