Release v0.4.0: bump version and finalize CHANGELOG date

Bump the crate version from 0.4.0-dev to 0.4.0 and stamp the 0.4.0
CHANGELOG heading with the release date.

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-## [0.4.0] - 2026-06-21
+## [0.4.0] - 2026-06-27
 
 ### Added
 

Cargo.lock

@@ -1074,7 +1074,7 @@ checksum = "9844ddc3a6e533d62bba727eb6c28b5d360921d5175e9ff0f1e621a5c590a4d5"
 
 [[package]]
 name = "fips"
-version = "0.4.0-dev"
+version = "0.4.0"
 dependencies = [
  "arc-swap",
  "bech32",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fips"
-version = "0.4.0-dev"
+version = "0.4.0"
 edition = "2024"
 description = "A distributed, decentralized network routing protocol for mesh nodes connecting over arbitrary transports"
 license = "MIT"