feat(neshub): iroh 1.3, and send each frame as one datagram batch

send_many_datagrams queues a frame's fragments under one lock hold and
one driver wake instead of one per fragment. It also rejects the whole
frame on TooLarge, so a path that shrinks mid-frame no longer leaves half
a frame on the wire for the client to time out. Eviction behaviour is
unchanged. A refused PyroWave frame now keeps its sequence number, since
nothing went out under it. pyro_bench mirrors both ends.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.lock

@@ -1705,9 +1705,9 @@ checksum = "791930b43c0d5973160d90a8f3894509f2b273430f5c5c73b668636d0287c5c0"
 
 [[package]]
 name = "iroh"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2f8d1cfffc83efe39a1031aab423ce09cb8048071baba550508931e9a81ce46"
+checksum = "885787b892b5e2507c701f132ecbd45d2bad4bbb75157a19427087c16dadb833"
 dependencies = [
  "backon",
  "blake3",
@@ -1755,9 +1755,9 @@ dependencies = [
 
 [[package]]
 name = "iroh-base"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffd1efd1aaecd68d4d1b0727a30c5811f43fb822843e48f65f6e5db3b7256cc9"
+checksum = "6ae9092be76c9f5429776ab3394f5a5a78dc19dc2524267e884a5b9781546c3f"
 dependencies = [
  "curve25519-dalek",
  "data-encoding",
@@ -1824,9 +1824,9 @@ dependencies = [
 
 [[package]]
 name = "iroh-relay"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beb2294a9749d6a25fd7cd8bcf0fccd932f20716d4f967d85d3f23c7135ae6a2"
+checksum = "ee116a8233f84980574bb8d11e4517503080cd2c3605bafca04ee9c35d708bd9"
 dependencies = [
  "blake3",
  "bytes",