feat: derive recent queue reserve from account capacity

modelhub_submmit_api/README.md

@@ -120,12 +120,12 @@ bash run_poll.sh --dry-run
   memory rule as new submissions. Only tasks whose own repository size times `1.20` exceeds
   their selected GPU capacity are stopped, after a fresh account-scoped active-state check.
   Incomplete size/capacity evidence is never used for cancellation.
-- Models older than seven days may occupy only positions 1–80 of each account's active queue.
-  The account pool enforces the boundary atomically. Once all accounts reach 80, discovery no
-  longer expands beyond seven days. Cleanup stops OOM tasks first, recalculates the surviving
-  queue order, and on startup stops old tasks still ranked 81 or later. Scheduled cleanup then
-  retains positions 81–95 and stops only old tasks ranked 96 or later. Recent overflow tasks stay.
-  Unknown ModelScope timestamps never authorize a cancellation.
+- Models older than seven days may occupy only the current account capacity minus its final 10
+  positions. The account pool enforces this per-account boundary atomically and updates it when
+  capacity probing discovers a higher limit. Cleanup stops OOM tasks first, recalculates the
+  surviving queue order, and applies the same limit-minus-10 boundary on startup. Scheduled
+  cleanup relaxes to limit minus 5 to avoid excessive pruning. Recent overflow tasks stay, and
+  unknown ModelScope timestamps never authorize a cancellation.
 
 ## Important Flags
 
@@ -161,10 +161,11 @@ Common flags:
 - `--max-cycles`: optional hard stop for testing or batch windows
 - `--disable-queue-cleanup`: disable automatic OOM and old-overflow queue cleanup
 
-The first automatic cleanup removes models older than seven days after each
-account's position 80. Later scheduled cleanups use position 95, while admission
-continues to reserve positions 81-100 for recent models. Override the later
-threshold with `MODELHUB_DYNAMIC_OLD_MODEL_CLEANUP_THRESHOLD`.
+The first automatic cleanup removes models older than seven days beyond each
+account's discovered capacity minus 10. Later scheduled cleanups use capacity
+minus 5, while admission continues to reserve the final 10 slots for recent
+models. Override these suffix sizes with `MODELHUB_RECENT_MODEL_RESERVE_SLOTS`
+and `MODELHUB_DYNAMIC_OLD_MODEL_CLEANUP_RESERVE_SLOTS`.
 
 Failure-informed preflight is enabled by default. It rejects deterministic
 missing-file and predicted-OOM cases, clamps unsafe context-length arguments,