chore: Set up shared-models library and initial project structure for NowChessSystems

.claude/agent-memory/scala-implementer/MEMORY.md

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+# Agent Memory Index
+
+## Project
+- [project_chess_tui.md](project_chess_tui.md) — Chess TUI in modules/core under de.nowchess.chess: model, renderer, parser, game loop

.claude/agent-memory/scala-implementer/project_chess_tui.md

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+---
+name: chess_tui_implementation
+description: Chess TUI implemented in modules/core under de.nowchess.chess — model, renderer, parser, game loop
+type: project
+---
+
+Chess TUI standalone app implemented in `modules/core`, package `de.nowchess.chess`.
+
+**Why:** Initial feature to demonstrate the system's TUI capability per ADR-001.
+
+**How to apply:** When extending the chess logic (legality, castling, en passant, promotion), build on the existing `Model.scala` opaque `Board` type and add methods via extension. The `@main` entry point is `chessMain` in `Game.scala`. `Test.scala` still exists as a separate hello-world stub — do not remove it.
+
+Key design choices:
+- `Board` is an opaque type over `Map[Square, Piece]` with extension methods
+- `Color` and `PieceType` are Scala 3 enums
+- `Renderer.render` returns `String`, never prints
+- `Parser.parseMove` returns `Option[(Square, Square)]` — coordinate notation only (e.g. `e2e4`)
+- No move legality validation — moves are applied as-is
+- ANSI 256-colour background codes used for light/dark squares (48;5;223 beige, 48;5;130 brown)