fix(wake): #927 enqueue TOCTOU — move stale-tmp cleanup off the hot enqueue path (no concurrent in-flight-write clobber) (#928)

Co-authored-by: jason.woltje <jason@diversecanvas.com>
Co-committed-by: jason.woltje <jason@diversecanvas.com>

packages/mosaic/framework/tools/wake/store.sh

@@ -95,6 +95,11 @@ cmd_init() {
     echo "store.sh: failed to init $STATE_DIR" >&2
     exit 1
   }
+  # Maintenance/daemon-start stale-tmp reap (#927). Cleanup is OFF the per-enqueue
+  # hot path; `init` is a natural once-per-start maintenance point. It is
+  # age-scoped, so even if an operator runs `init` while an enqueue is in flight
+  # it can only reap demonstrably-orphaned (crash-left) tmps, never a live write.
+  _wake_clean_stale_tmp "$STATE_DIR"
   echo "$STATE_DIR"
 }
 
@@ -163,6 +168,11 @@ cmd_enqueue() {
     exit 2
   fi
 
+  # Ensure the layout exists. NB (#927): _wake_init_dir NO LONGER reaps stale
+  # tmps — that would race a concurrent enqueue's live in-flight write (deleting
+  # its tmp mid-rename -> spurious "durable pending write FAILED"). Stale-tmp
+  # reaping is a maintenance action (store.sh init / detector tick), never on this
+  # hot path.
   _wake_init_dir "$STATE_DIR"
 
   # --- serialize the whole allocate+write transaction (#908) ----------------