[DysektAI]

Stacked on #71 — retarget to master after it merges. Depends on tarkovtracker-org/RatEye#5; the submodule points at that PR's head (ee7fa47) and should be re-pointed to the merged SHA before merge.

Why

RatEye loads static templates lazily inside the first icon scan of each slot size, under the icon-scan lock, after hashing the icon folder. Every engine build therefore made the next icon scan ~300 ms slower.

What

• After a publish, warm the most common slot sizes covering 80% of items (1x1, 2x1, 2x2, 1x2 on the live catalog) on a background task, one size at a time under IconScanLock and only while that engine is still published, so a rebuild can never dispose it mid-load.
• RatEye bump: warm-up API, no per-scan full-image debug clone or full-capture ToBitmap.
• Latency harness gains a warm-up case; gauge engine.icon_warmup_ms.

Results (Release, 2560x1440 fixtures, 3 runs)

Metric	Before	After
First icon scan after an engine build	~490-550 ms	~195-230 ms
Background warm-up	—	~620 ms (2.1 s first-ever, cold disk cache)
Idle private bytes	~692 MB	~715 MB
Idle GPU 3D / CPU median	0% / 0	0% / 0

Validation

• IconWarmUpSlotSizesTests (ordering, coverage cut-off, zero sizes, empty catalog); RatEye warm-up tests with mutation proof.
• Debug and Release build; dotnet test 412/412; CodeRabbit findings fixed (GPU per-instance deltas, ROI Mat disposal).

https://claude.ai/code/session_01QFKiA2aswHyp8SnpraLxE2

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