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docs(A.5): two-tier streaming + horizon LOD implementation plan

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28-task TDD-first implementation plan for Phase A.5. Maps each spec
section to concrete bite-sized tasks with failing-test → minimal-impl
→ commit cycles. Self-review at plan footer cross-checks coverage,
type consistency, placeholders.

Plan structure:
- T1-T6: StreamingRegion two-tier + 5-list TwoTierDiff with hysteresis
- T7: LandblockStreamResult.Loaded.Tier + MeshData; Promoted variant
- T8: WorldEntity AABB cache + dirty flag
- T9-T12: off-thread mesh build (ConcurrentDictionary + DatLock + worker activation + DI)
- T13-T16: StreamingController two-tier + GpuWorldState two-tier ops + GameWindow wiring
- T17-T18: WbDrawDispatcher bucketing tightening (Change #1 + Change #2)
- T19-T21: visual quality (mipmaps + A2C + depth-write lock-in)
- T22: fog params from N₁/N₂ + env-var multipliers
- T23: BUDGET_OVER flag in DIAG output
- T24-T26: perf baseline (before/after) + visual user gate
- T27-T28: roadmap/ISSUES/CLAUDE.md updates + memory + SHIP commit

Plan at docs/superpowers/plans/2026-05-09-phase-a5-two-tier-streaming.md.
Spec at docs/superpowers/specs/2026-05-09-phase-a5-two-tier-streaming-design.md (fcaff71).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Erik 2026-05-09 22:10:38 +02:00
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