chore: bump to 0.4.1, changelog for the MSRV floor raise (1.85 -> 1.88)

Verification: 113 default / 156 all-features tests on stable (1.94) and
on a real 1.88 toolchain, clippy (all-targets) clean, fmt clean, doc
clean, wasm32 check + clippy clean, publish dry-run OK.

CHANGELOG.md

@@ -4,6 +4,29 @@ All notable changes to this crate are documented here. The format is
 based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and
 this crate adheres to [Semantic Versioning](https://semver.org/).
 
+## [0.4.1] - 2026-09-10
+
+The MSRV floor becomes honest: `rust-version` raises from 1.85 to
+1.88. The 1.85 claim was already false at the dependency level — the
+lockfile pins `alkcall 0.7.x`, and alkcall 0.7.1 raised its MSRV floor
+to 1.88 (the ecosystem MSRV audit: noq's 1.88 matching the QUIC path;
+iroh sits above at 1.91), so no 1.85 toolchain could build 0.4.0
+regardless of what Cargo.toml declares. The raise breaks no downstream
+that could build the crate before. No API or wire-format change;
+downstreams on caret requirements pick this up on their next `cargo
+update`.
+
+### Changed
+
+- **`rust-version` 1.85 → 1.88.** Verified on a real 1.88 toolchain
+  (full test suite, clippy). alktty's own code is 1.85-clean —
+  `cargo check` under a 1.85 toolchain passes with the pre-bump
+  lockfile — so the raise is dependency-driven only and needed no
+  clippy fixes. Behavior-identical.
+- **`alkcall` requirement updated to `0.7.1`; lockfile bumped from
+  0.7.0 to 0.7.1.** Version-requirement-only (0.7.x is already the
+  resolved family); alkcall 0.7.1 changed no type alktty touches.
+
 ## [0.4.0] - 2026-09-07
 
 The alkcall 0.7.0 adoption (the connect-side caller-identity seam,
@@ -265,6 +288,7 @@ alknet mono-repo.
   the client→backend pump is aborted at session end instead of
   lingering until the client disconnects.
 
+[0.4.1]: https://git.alk.dev/alkdev/alktty/releases/tag/v0.4.1
 [0.4.0]: https://git.alk.dev/alkdev/alktty/releases/tag/v0.4.0
 [0.3.0]: https://git.alk.dev/alkdev/alktty/releases/tag/v0.3.0
 [0.2.0]: https://git.alk.dev/alkdev/alktty/releases/tag/v0.2.0