release: v0.2.1 — switch smarm to the pinned v0.6.0 git tag

RFC 019 lands upstream: per-actor stacks, park-path shrink, recycle zap,
SIGSEGV diagnostics, introspect surface. No urus code changes required —
E1 interleaved A/B on the box shows every ka cell within +0.3..+2.9% of
the v0.5.0 pin (t8-c4 close-mode control is bistable either side; see
smarm v0.6.0 release notes). Tag must exist upstream before this builds:
push smarm master + v0.6.0 first.

Cargo.toml

@@ -1,12 +1,13 @@
 [package]
 name = "urus"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 rust-version = "1.95"
 description = "Cowboy/bandit-style HTTP library for the smarm actor runtime"
+license = "MIT"
 
 [dependencies]
-smarm    = { git = "https://git.kalsbeek.dev/Markk116/smarm", tag = "v0.5.0" }
+smarm    = { git = "https://git.kalsbeek.dev/Markk116/smarm", tag = "v0.6.0" }
 httparse = "1.9"
 libc     = "0.2"
 sha1_smol = "1"

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Mark Kalsbeek
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.