feat(rfq): debounce and rate-limit levels republish after quote expiry

- Add `LEVELS_REPUBLISH_COALESCE` (25ms) debounce to batch `quoteExpired` frames
  into a single levels flush, preventing reconnect replay from emitting one book
  per expiry and collapsing the cadence to ~2s
- Implement rate window tracking to respect venue's 40/s `admitMessage` cap across
  levels frames, quote replies, and expiry flushes in a 1s rolling window
- Track `pending_republish` set of corridors with dropped quotes; arm trailing
  flush only when known corridors expire, not on every frame
- Skip trailing flush when dark feeds exist (no ready frames) to avoid wasting
  budget, but keep debounce armed to retry when feed recovers
- Defer trailing flush if 40/s budget is exhausted; schedule retry when oldest
  batches age out of the 1s window
- Skip interval tick when trailing flush is pending or recently fired (within last
  1s) to prevent doubling book depth in the same second; reschedule tick to end of
  expiry window to avoid phase drift
- Drop emitted corridors from `pending_republish` after successful send to prevent
  resending on next expiry and growing the set unboundedly
- Use `biased` select to prioritize inbound over interval tick so `quoteExpired`
  beats the timer until trailing debounce fires, fixing starvation where books
  dropped after the venue's 1s republish wait completed
- Add `Reservations::corridor()` peek method to identify which corridor a quote
  belongs to, enabling targeted expiry flushes instead of full republish
- Add comprehensive tests covering rate window mechanics, debounce timers, dark
  feed detection, and interval suppression logic

Author: bnolens

.textile-monorepo-source

@@ -1 +1 @@
-13abce09db04af686db9d4002b51322d3e8a4ae4
+c4c41ccd27cc21b3504d72856652ca5cf19a6e90

.textile-stitch-release-version

@@ -1 +1 @@
-0.1.205
+0.1.206

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "stitch-bot"
-version = "0.1.205"
+version = "0.1.206"
 edition = "2021"
 description = "Stitch — Textile filler-network operator bot; market-makes the filler order book with signed UniswapX limit orders."
 license = "AGPL-3.0-or-later"