plan(N.5b): implementation plan for terrain on modern path
Expands spec section 10 into 10 TDD-style tasks with explicit
dependency arrows. Phase A (T1, T2, T4, T5, T7) parallelizable
across 5 subagents; Phase B (T6 dispatcher) serial; Phase C (T8
GameWindow integration) serial; user verification gate; Phase D
(T9 delete legacy + T10 docs/memory) parallelizable.
Each task includes exact file paths, complete code blocks, exact
test/build commands with expected output, and HEREDOC commit
messages. Self-review: no placeholders; type-consistent across
tasks (TerrainSlotAllocator API, GetBindlessHandles signature,
SetSamplerHandleUniform contract).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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