sea-napi-binding: cleanup — drop unused tracing deps; address bloat findings

Round 1 scaffold declared tracing + tracing-subscriber as deps but
never used them. Removed. Logger bridge will re-add in round 3.

Other findings from 6b3affd-2026-05-15.md reviewed:
- Finding 2 (Database::Drop unreachable in Round 1b) — obsoleted by
  Round 2 (40d0b57): database.rs no longer declares a Database struct
  or Drop impl; it is now an `open_session` free function.
- Finding 3 (empty Connection::Drop) — obsoleted by Round 2: the Drop
  impl now spawns a real fire-and-forget close on the captured tokio
  handle.

Co-authored-by: Isaac

Author: msrathore-db

native/sea/Cargo.toml

@@ -42,11 +42,6 @@ tokio = { version = "1", default-features = false, features = ["rt", "sync"] }
 # Lazy `OnceCell` for the captured tokio Handle.
 once_cell = "1"
 
-# Tracing for kernel + binding diagnostics. The real subscriber is wired
-# in Round 3 via the ThreadsafeFunction logger bridge.
-tracing = "0.1"
-tracing-subscriber = { version = "0.3", default-features = false, features = ["fmt"] }
-
 # `catch_unwind` wrapper around async futures (pattern #8 of the
 # napi-rs patterns doc). Transitively a dep of the kernel already, but
 # declared here so we can `use FutureExt;` directly.