SMLib: pin eaa998a (tangency-labs/smlib#68, #69, #70)

Batch 4: drafts and loops, mitre corners, rim chamfers, rulings, tight box, stitch, point
classification, eased corners. Batch 5: a face's tight box divides its cells at the surface's
knots (thread boxes exact); a cylinder, cone, sphere or torus is extended along its own circles.
Batch 6: a revolution's extension closes its turn; a dropped point's foot is the converged one.
The C API is ABI 5 (smlib_blend_dropping and smlib_brep_classify_point are new; nothing existing
changed), so the binding expects 5.

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

crates/smlib/SMLIB_PREBUILT

@@ -1,10 +1,10 @@
 # Rust target, SHA-256 of smlib-<target>.tar.gz in the release prebuilt-<SMLIB_REV> of
 # tangency-labs/smlib. Written by scripts/fetch-smlib.sh --pin; never edited by hand.
-aarch64-apple-darwin 40e2e07835f7622f7b376e7586f2fd76406e6c8ae4d7d9db0047db9cba26a69d
-aarch64-pc-windows-msvc dd406f2d33186b83f2e0134d1c71fb32e67c36a3dddbceb834161a9a2f5bdb17
-aarch64-unknown-linux-gnu ae66dca5c3687c298997299bbd54ce932ef6ea5223538a23f79784e625751a83
-i686-pc-windows-msvc a03b6d407a5ddc7ec07a94064fde8ae2962f3397da1b4ad2465cef4c8f2720ea
-wasm32-unknown-unknown b62905369f173728f12f252a7d3bd49827e39e2d9bdedfcd54555359508acb5a
-x86_64-apple-darwin 482da759ea62ffc0fbfaaa33eb90496852b5431bd06661465f3ebf2387ee23fa
-x86_64-pc-windows-msvc 12c285085d7fceecd3dd18712ed4cabc717ea3b4db32712ece5958c9a40492ad
-x86_64-unknown-linux-gnu 1ba8094a1a2632c1cc46064e68dfadada2f9ce1c988b80155950de901114b68f
+aarch64-apple-darwin 7fd9d91efce1734bd0c23508edc0c73cb51c628b66bb46a9bfa1dda517b97905
+aarch64-pc-windows-msvc d0eab3091b45e846270f9be9bcbce179cac81714b3b65e3af28e666496618d2c
+aarch64-unknown-linux-gnu e806ed20c2e934e5d9bf2b2399a183fa872821bab4a6535b39c5ea5f880f5aa0
+i686-pc-windows-msvc 552ad793372bf13b97948619768d15cb73339a8dd185ada680ea7f21d3b38f56
+wasm32-unknown-unknown 17709e5353b8cb9bec999481da6df679e12d0d590dec404f27e64b0b786cebff
+x86_64-apple-darwin b4af82aa01ad58005ddd2d9d9344d9673d4ed099c16e020faf87449251ea330b
+x86_64-pc-windows-msvc 64812df7d5b80e59686d88494692bac12eaab153c951a4b189dec87d79e88736
+x86_64-unknown-linux-gnu 2588040848d30ae3493777a09059f9ebe50b87f52e84d13a281f9c6a4446dd64

crates/smlib/SMLIB_REV

@@ -1 +1 @@
-68fb91627edfea2c5d9251b949c6f2ef8eb23c56
+eaa998a30f184fefc98f7322793e3a4dc5ef68ce

crates/smlib/src/ffi.rs

@@ -7,7 +7,7 @@
 use std::ffi::{c_char, c_void};
 
 /// `SMLIB_ABI_VERSION` this crate was written against.
-pub const ABI_VERSION: i32 = 4;
+pub const ABI_VERSION: i32 = 5;
 
 pub const OK: i32 = 0;
 pub const ERR_EXCEPTION: i32 = -1000;