HeightMap: core class with scalar operations (closes #193)

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Implement the foundational HeightMap class for procedural generation:

- HeightMap(size, fill=0.0) constructor with libtcod backend
- Immutable size property after construction
- Scalar operations returning self for method chaining:
  - fill(value), clear()
  - add_constant(value), scale(factor)
  - clamp(min=0.0, max=1.0), normalize(min=0.0, max=1.0)

Includes procedural generation spec document and unit tests.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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John McCardle 2026-01-11 20:07:55 -05:00

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