docs: hand off placement campaign finish

memory/project_collision_port.md

@@ -1,7 +1,38 @@
 # Collision System Port - Status and Plan
 
+## 2026-08-03 production cutover stabilization checkpoint
+
+Production initial Create placement is cut over through the Runtime residence
+and continuation-executor path. The O(changed) collision-publication
+checkpoint is live, followed by five root-cause fixes:
+
+- `01f4791e`: pending-only live projections no longer create/replay a second
+  origin-recenter retirement receipt;
+- `670f307c`: remote Create placement, local-player hosting, targeting, chase,
+  and attack share the same world-coordinate frame;
+- `1fc529cd`: distant Use materializes the canonical minimal static host before
+  MoveTo;
+- `f24532ad`: effects, projectiles, and static animation bind after canonical
+  placement and follow the committed cell;
+- `175ad6b0`: LoginComplete waits for the local first-placement terminal edge.
+
+The user accepted those connected behaviors. The campaign remains open for
+six fixture reconciliations, C4 placement routes 2–7, #276/#277, destination
+prefetch #280, C5's final-binary suite/soak/two-client matrix, AP-22, and
+AD-10. Canonical continuation prompt:
+`docs/research/2026-08-02-collision-throughput-handoff/NEXT-AGENT-PROMPT.md`.
+
+**Do not use the 2026-04-29 whole-world staging-root description below as a
+production blueprint.** It is retained as historical context. O1/O2/O3 at
+`71604331` replaced that clone/journal/rebase design with the per-landblock
+O(changed) publication mechanism; `01f4791e` then repaired its recenter
+receipt lifetime.
+
 ## 2026-08-01 initial Create residence checkpoint
 
+> Historical checkpoint; superseded by the 2026-08-03 production cutover
+> status above.
+
 The dormant Runtime SetPosition path is now complete through activation,
 graphical/no-window placement receipts, collision-prefix quiescence, exact
 authoritative route classification, pre-placement App staging, and initial