Set version to 0.4.1 and correct the v0.4.0 release date

Drop the -dev suffix from the package version and refresh the lockfile.
The version is single-sourced from CARGO_PKG_VERSION, so build.rs and
src/version.rs need no change.

Also fix the archived v0.4.0 release notes, which still read
"2026-06-21 (provisional)" while the changelog records the actual
release date of 2026-06-27. The date was confirmed in the changelog at
the time but not in the two release-notes files that carry it, so the
shipped notes have been showing a wrong date and the word provisional
since that release. The root mirror is regenerated for v0.4.1, so only
the archived copy needed correcting.

Cargo.lock

@@ -1074,7 +1074,7 @@ checksum = "9844ddc3a6e533d62bba727eb6c28b5d360921d5175e9ff0f1e621a5c590a4d5"
 
 [[package]]
 name = "fips"
-version = "0.4.1-dev"
+version = "0.4.1"
 dependencies = [
  "arc-swap",
  "bech32",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fips"
-version = "0.4.1-dev"
+version = "0.4.1"
 edition = "2024"
 description = "A distributed, decentralized network routing protocol for mesh nodes connecting over arbitrary transports"
 license = "MIT"

docs/releases/release-notes-v0.4.0.md

@@ -1,6 +1,6 @@
 # FIPS v0.4.0
 
-**Released**: 2026-06-21 (provisional)
+**Released**: 2026-06-27
 
 v0.4.0 is the throughput-and-observability release on the v0.3.x wire
 format. It adds two new ways for nodes to find and reach each other (the