SMLib: pin 7ac037e (the new blend's tangent-end event, zero-speed G2 ends, and its exact-class rounds)

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 3a782c2d9f89878fcb19c0ea9dfc29853204a6f6af37576722ed6334b06552c0
-aarch64-pc-windows-msvc f7a5cbe28c65a8d9dd88e22939ac3c12d5b54431ad16f1b0a1f6aa5882de2b9d
-aarch64-unknown-linux-gnu bb1166f65589ce2c385550708992d0798e010d6689952ae07232aeec438e5879
-i686-pc-windows-msvc cadf6d7c35b3e20345e064d4369c777d62561afac5cf5b7be52da6dd6f9aa785
-wasm32-unknown-unknown 250573fd99e9b109ae9f8ac16ecd4a5e55dfcd13c060763c89167bc2ee4bd4b8
-x86_64-apple-darwin 13cf77518ccbd9a3095e0d2eaabb7844c94079aa4ef88ef10fe5a2bf1eb18438
-x86_64-pc-windows-msvc 44b729d524b85de5b0aba2f24cdb6a9e449d644ef3ea4129dabbf5338b835018
-x86_64-unknown-linux-gnu 7fe1a151932370b6ab4dee1e3fad30f62e4b9d2a1ac7bd1ca423061a15276a09
+aarch64-apple-darwin b3de509abbe7c2846bdad3eed7392bdc9479e9454bb9766b3aa165958e818590
+aarch64-pc-windows-msvc b367f78daa5a8aa54fca72d2f3aab891ab8043a1f592589e8081fdb75a7cd947
+aarch64-unknown-linux-gnu b0378b5fcba90aff5209a36a0aa63d86a0f83e84cec5c7dce20c27bc1515ded3
+i686-pc-windows-msvc c253907bac0fc5b6908396bd9be2f81404be2425a36934be7514580aedc5552f
+wasm32-unknown-unknown 537e2361deeb363ce3251f4294d93af6ca0e194abdded5a960fa51c2109803fd
+x86_64-apple-darwin 38e663d2ea28a3f1407576e295f2342d8ed0f187c0c7740369db6a2257d5d1a2
+x86_64-pc-windows-msvc 13c46708e298f1e0c35207d4a72479bab64f8841e29ea6a217f545ace453acac
+x86_64-unknown-linux-gnu 0e10967871fee4372e5f10382661b1af248ac84cc22f9bbbe44c6d4b4c71b1d9

crates/smlib/SMLIB_REV

@@ -1 +1 @@
-26cc45185b7ee6faba5b684f83d7bc2c53c1a559
+7ac037e5055c6c045be619c05b5b20f90acdb3d8