4b-1 builds the machinery and changes no remote behaviour: a per-entity remote
placement owner, a Position-time service-window guard on both hosts, the
refuse-rather-than-park policy, N3's headless RetryPending pump, and parked-count
observability. No production caller, so 4b-2 and 4b-3 flip it on afterwards.
It lands alone because it is where the park-withdraws-the-entity failure mode is
decided, and that decision needs its own review signal rather than sharing one
with a ~700-line class deletion.
Pins the central decision: refuse rather than park. A DeferredCell park withdraws
the entity (InWorld false, Active cleared, clock suspended, residency dropped),
and Forget-on-every-accepted-Position kills the park without restoring any of it
— so a remote that parks and is then superseded by an Interpolate packet stays
withdrawn indefinitely, invisible and intangible.
Names the two transfer errors that would look correct to anyone copying route
2's controller: do not port the ack machinery (retail's remote arm has no
SendPositionEvent) and do not port the re-issue funnel (re-issuing a superseded
pose is wrong for a repeated 5-10 Hz stream).
Makes ParkCollisionResidents' overlap throw a gate item rather than a note — it
is unreachable today only because steady-state remotes hold no operations, and
with N remotes an ordinary streaming retirement would become session-fatal.
Lists what 4b-1 must not touch, including AP-135's two writes (4a-owned
dispositions that sit inside the method 4b rewrites — the trap) and the single
retail ConstrainTo arming site.
Records both known flakes by number and mechanism so they cannot be conflated
again: #302 is a GC-allocation assertion in App.Tests, #308 a wall-clock deadline
in Core.Net.Tests.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
