perf(content): close prepared asset cutover

docs/ISSUES.md

@@ -24,7 +24,7 @@ What does NOT go here:
 - Every session: scan OPEN issues at start; promote/close anything we touched during the session before ending.
 - Promoting to a Phase: mark as `DONE (promoted to Phase X)` + commit SHA where the Phase entry landed.
 
-## Current queue — 2026-07-23
+## Current queue — 2026-07-24
 
 - **Structural handoff:** all eight `GameWindow` decomposition slices and the
   automated closeout are complete. The 1,622-line native shell has typed
@@ -44,6 +44,9 @@ What does NOT go here:
   smooth and physics, collision, and wire state remain correct.
 - **Build hygiene:** `#228` records 17 clean-Release test-project warnings;
   production compilation and all tests pass.
+- **Performance side track:** prepared-content Slices A–C are complete;
+  `#244` is closed and Slice D unified residency/accounting is next. Evidence:
+  [`research/2026-07-24-slice-c-prepared-asset-cutover-report.md`](research/2026-07-24-slice-c-prepared-asset-cutover-report.md).
 
 The [documentation map](README.md) defines how this tactical ledger relates to
 the milestone, roadmap, architecture, divergence register, research, and
@@ -453,7 +456,7 @@ insert site ~1757).
 
 ## #244 — SequencerFactory probes Setup without a DID guard or catch; [dat-miss] logs under the database lock
 
-**Status:** OPEN
+**Status:** DONE — 2026-07-24, Modern Runtime Slice C
 **Severity:** MEDIUM
 **Filed:** 2026-07-24
 **Component:** composition / content
@@ -470,11 +473,14 @@ probes hit the dated TEMP `[dat-miss]` `Console.WriteLine`
 synchronous console I/O while holding `_databaseLock`, serializing all
 readers of that dat.
 
-**Root cause / status:** 2026-07-24 audit review finding. Plan Slice C's
-typed DID metadata removes the probe pattern; the Slice C amendment also
-requires narrowing `ResolveActivation`'s blanket catch. The `[dat-miss]`
-tripwire should be resolved (root-caused or demoted to a rate-limited
-diagnostic) in the same change.
+**Root cause / status:** Slice C's prepared TOC presence index now gates both
+`SequencerFactory` and `ResolveActivation`, so GfxObj IDs do not enter the
+Setup parser. Known malformed DAT failures are diagnosed once; cancellation
+and unexpected failures propagate. The remaining `[dat-miss]` anomaly report
+now captures its condition while holding the serialized DAT lock, performs
+console I/O only after releasing it, and is limited to one report per database.
+Connected capped, uncapped, and dense routes recorded zero invalid Setup-probe
+exceptions.
 
 **Files:** `src/AcDream.App/Composition/LivePresentationComposition.cs:200-225`;
 `src/AcDream.Content/DatCollectionAdapter.cs:196-206`;