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feat(A.5 T5): StreamingRegion two-tier RecenterTo + TierResidence tracking

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Adds TierResidence enum (None/Far/Near), _tierResidence dictionary seeded
by MarkResidentFromBootstrap, and the canonical two-tier RecenterTo overload
returning TwoTierDiff. Pass 1 walks the new far window and emits ToLoadFar /
ToLoadNear / ToPromote; Pass 2 walks prior residents and emits ToDemote /
ToUnload using Chebyshev hysteresis thresholds (NearRadius+2 / FarRadius+2).
EncodeLandblockIdForTest exposes the encoding rule to test assemblies.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-09 22:36:20 +02:00
parent 7bcababf82
commit fb6b61e8ef
2 changed files with 165 additions and 1 deletions
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19
tests/AcDream.Core.Tests/Streaming/StreamingRegionTwoTierTests.cs
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@ -34,4 +34,23 @@ public class StreamingRegionTwoTierTests
Assert.Empty(diff.ToDemote);
Assert.Empty(diff.ToUnload);
}
[Fact]
public void RecenterTo_PlayerWalks_NullToFar_AppearsInToLoadFar()
{
var region = new StreamingRegion(centerX: 100, centerY: 100, nearRadius: 1, farRadius: 3);
_ = region.ComputeFirstTickDiff();
region.MarkResidentFromBootstrap();
// Walk one LB east — center (100,100) → (101,100). LB column at lbX=104
// (relative dx=+3 from new center) enters the far window from null.
var diff = region.RecenterTo(newCx: 101, newCy: 100);
foreach (var y in new[] { 97, 98, 99, 100, 101, 102, 103 })
{
var id = StreamingRegion.EncodeLandblockIdForTest(104, y);
Assert.Contains(id, diff.ToLoadFar);
}
Assert.Empty(diff.ToLoadNear);
}
}