fix(runtime): name why a placement is parked and fail closed when it cannot resolve

Fixes #284 (plan S1).

A first-entry placement that could not be prepared returned
RetrySetupUnavailable and was re-Advanced every pump forever. Nothing counted
it, nothing named its cause, and nothing distinguished "waiting for something
that will arrive" from "waiting for something that never can". That is why
#281's 43 test failures presented as four unrelated symptoms across App and
Runtime instead of one cause, and why a stuck entity in the live client simply
never appears with no log line to follow.

Worse, the two causes were conflated: 670f307c's missing-world-frame park
reported itself as RetrySetupUnavailable, sending anyone diagnosing it to the
prepared-asset pipeline rather than to the absent local-player Create that
actually publishes the frame.

- RetryWorldFrameUnavailable splits the two causes. Call sites now ask
  IsRetryable() instead of comparing against one reason, so a future retry
  reason cannot be silently reclassified as a hard rejection - the exact way
  this class of bug hides.
- The operation retains its RuntimeSetPositionParkReason, and
  RuntimeSetPositionOwnershipSnapshot reports parked work by cause
  (ParkedAwaitingSetupCollisionCount / ParkedAwaitingWorldFrameCount /
  ParkedPlacementCount), so parked placements appear wherever ledgers are
  already asserted.
- ObserveLocalPlayerCreate records the accepted local-player Create even when
  it carries no landblock - precisely the case where no frame is ever
  published - and ThrowIfWorldFrameUnreachable makes that contradiction
  terminal. Waiting is legitimate only while that Create is outstanding; after
  it, no later pump can supply the frame. Same shape as 01f4791e, which made a
  violated receipt-ledger invariant terminal rather than resumable.

This is observability plus fail-fast. There is no timeout, no retry cap, and
no grace period anywhere in it; retryable work still retries exactly as before
and no placement behaviour changed.

The parked counts are deliberately NOT folded into IsConverged: #277 documents
a far Create legitimately parking for a whole session, so a parked entry at
teardown is not automatically a defect. Wiring them into the connected gates
is carried with #277's service-window conversion, where "legitimately parked"
becomes definable.

Runtime 1,012/1,012. Complete Release solution: 10,834 passed / 4 skipped /
0 failed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/AcDream.Runtime/Gameplay/RuntimeLocalPlayerFirstEntryState.cs

@@ -364,8 +364,10 @@ internal sealed class RuntimeLocalPlayerFirstEntryState
                     collisionSource,
                     gameTime,
                     out RuntimeSetPositionCommand command);
-            if (moverStatus
-                == RuntimeSetPositionMoverPreparationStatus.RetrySetupUnavailable)
+            // #284: every retryable reason resumes on a later pump. Comparing
+            // against one reason would silently reclassify a new one as a
+            // hard rejection.
+            if (moverStatus.IsRetryable())
             {
                 return RuntimeLocalPlayerFirstEntryStatus
                     .AwaitingCollisionSource;