docs(performance): close modern runtime slice H

docs/research/2026-07-25-slice-h-closeout.md

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+# Modern runtime Slice H closeout
+
+## Result
+
+Slice H's scoped work is complete:
+
+- retained UI report layout, visible cooldown participation, changed-only
+  attachment reconciliation, and retained frame scratch;
+- exact bounded global-light selection;
+- one pooled cancellable receive owner, borrowed packet decode, and direct
+  recurring outbound framing.
+
+No retail gameplay, packet-ordering, acknowledgement, heartbeat, visibility,
+light-membership, or UI-presentation rule changed.
+
+## Automated conformance
+
+At production commit `41c1a593927fcf71ef83b4825c659a4970e9b858`:
+
+- `dotnet build AcDream.slnx -c Release`: pass, with the 16 already tracked
+  test-project warnings;
+- complete Release solution: 8,292 passed / 5 skipped;
+- network-focused suite: 600 passed;
+- receive decode differential: all optional fields, login, fragment,
+  malformed-packet, and ISAAC-state cases pass;
+- recurring send differential: exact bytes, checksum, sequence, and ISAAC
+  consumption pass.
+
+Warm microbenchmarks:
+
+| Path | Before | After | Result |
+|---|---:|---:|---:|
+| 500,000 borrowed 48-byte packet decodes | 246.372 ms / 200,000,040 B | 28.431 ms / 40 B timer overhead | 8.666x throughput; production decode 0 B |
+| 500,000 recurring 44-byte sends | 137.206 ms / 176,000,040 B | 12.551 ms / 0 B | 10.932x throughput; direct framing 0 B |
+
+## Connected lifecycle gate
+
+Command:
+
+```powershell
+tools/run-connected-world-lifecycle-gate.ps1 `
+  -Repository <repo> `
+  -SkipBuild `
+  -SessionTimeoutSeconds 420
+```
+
+Raw local evidence:
+`logs/connected-world-gate-20260725-060344/report.json`.
+
+Result: PASS.
+
+- Capped session: login, Aerlinthe, Rynthid, Facility Hub, Holtburg after
+  dungeon, and Aerlinthe revisit all reached a complete visible reveal.
+- Fresh uncapped process: reconnect reached a complete visible reveal.
+- 7/7 checkpoints were ready with render, composite, and collision readiness.
+- No reveal invariant failure, packet/transport failure, `WeenieError`,
+  `ObjectDisposedException`, or receive-owner death occurred.
+- Both sessions issued graceful logout, received authoritative confirmation,
+  exited through `WM_CLOSE`, and ACE observed `PacketHeader Disconnect`.
+- The only warning was 25 expected world-edge landblock misses.
+
+This was an RDP run. It proves correctness, ordering, ownership, cleanup, and
+reconnect behavior; its absolute CPU/GPU/frame-time numbers are not accepted
+as hardware performance evidence.
+
+## Production allocation check
+
+The connected gate enables lifecycle screenshots and therefore constructs the
+G4 current-path comparison oracle. That oracle fingerprints and sorts the
+complete visible projection set each frame and intentionally allocates in
+proportion to scene size. Its 3.9-10.5 MiB/frame outdoor readings are
+automation observer cost, not the normal production composition.
+
+A separate uncapped Release login was captured with no UI probe, automation
+artifact directory, or current-path oracle:
+
+```text
+cpu_ms p50=1.9-2.0, p95=2.5-2.8
+gpu_ms p50=1.2-1.3, p95=1.5
+alloc_kb p50=25.6
+```
+
+The RDP timing is diagnostic only. The allocation measurement is valid:
+allocation-tick stacks attribute the remaining production bytes primarily to
+the existing `Transition` collision scratch and retained current render
+partition, followed by smaller animation/UI iterators. Those owners are
+explicitly scheduled for Slice I and G5. The H-owned warmed receive and send
+paths themselves are zero-allocation.
+
+Accordingly, H closes its scoped owners without weakening the program-level
+target: steady production allocation at or below 4 KiB/frame remains a
+mandatory G5/Slice-I closeout gate.
+
+## Exact retained visual rollback
+
+The G4 production draw-source visual gate is still pending. If it fails on a
+physical display, revert only:
+
+```text
+git revert ef1d263337997bb030eadb7b8e71d73dc659907a
+```
+
+Do not revert G3 or the `129dd77d` / `03b10183` portal-warmup corrections.