Improve text-2048 board setup with validation and structured state

[MagellaX]

Summary

• Clamp requested board sizes (3–8) and include a note when inputs are coerced
• wrap the setup call in a lightweight HUD trace and return both the ASCII board and a JSON payload of the initial game state
• add async regression tests that stub telemetry and verify valid/invalid sizes via the underlying tool function

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Note

Adds board-size validation/clamping, lightweight telemetry tracing, and returns both ASCII and JSON state; includes async tests covering outputs and bounds.

• text-2048 setup:
  • Add _normalize_board_size to coerce and clamp board_size to MIN_BOARD_SIZE..MAX_BOARD_SIZE with notes.
  • Update setup_board in hud_controller/setup/board.py:
    • Use constants DEFAULT_BOARD_SIZE, MIN_BOARD_SIZE, MAX_BOARD_SIZE.
    • Wrap initialization in trace("text-2048 setup", attrs=...) (with no-op fallback if telemetry missing).
    • Reset game with normalized size and return two blocks:
      • ASCII summary of initialization.
      • JSON payload with requested_board_size, board_size, and initial state.
• Tests (hud/tests/test_text_2048_setup_board.py):
  • Add async tests using DummyGame and stubbed trace to verify ASCII + JSON outputs and clamping of out-of-range sizes.

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[MagellaX]

thoughts? @jdchawla29 @lorenss-m