fix(fuse): keep a move that lands while its create is read back (B161)

adopt_real_uid asked whether a move was queued only after reading the
node back. A move that landed in between left no op, and the answer still
had the old name, so the mount showed the file under it. Ask first.

The fake Drive can hold a read's answer (hold_answer_to_next_read) so the
test can land the move while the answer is on its way.

docs/MILESTONE-3.0.0-STATUS.md

@@ -9,7 +9,7 @@ Tracks `docs/MILESTONE-3.0.0.md`. Update it with every commit that moves a phase
 - **Phase 2**: local ids, inode = local id, one tree for every mount (2.10.0).
 - **Phase 3, first part**: mkdir, create, rename, unlink and rmdir on the mount are recorded
   locally and sent from the queue; `"local_first": false` brings back the old path (5e0f30c).
-- Fixes from the simulation and account runs since then: B127 and B141 to B160.
+- Fixes from the simulation and account runs since then: B127 and B141 to B161.
 - **Sync issues, first cut** (§6.2): refusals sorted into issues, shown at once in the app,
   tray and CLI; Export button and `pdfs sync export`; `pdfs sync issues`.
 
@@ -85,7 +85,8 @@ Tracks `docs/MILESTONE-3.0.0.md`. Update it with every commit that moves a phase
          landing out of order (B158, fixed). Flaky-link seed 4 failed one of ten runs on a
          lookup that answered `EAGAIN` while the root was listed again after a restart (B159,
          fixed). Slow-link seed 4 also had folders reach Drive 30 s late, after the
-         drain's idle poll (B160, fixed).
+         drain's idle poll (B160, fixed). Slow-link seed 3 failed on a file moved while its
+         create was on the wire, which the mount showed under its old name (B161, fixed).
    - [ ] Known-bug list in `sim/run.rs` is empty: B125 and B130 open; B127, B129 and B132 fixed
          but unconfirmed.
    - [ ] A clean account run. The one on a6f36d5 (2026-10-04, LAN: 427 passed, 12 failed)