chore(release): v2.5.0

Bump all workspace crates, the node package and pyproject to 2.5.0, fold the
two unreleased sections together and add upgrade notes for the behaviour
changes.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

crates/clawhdf5-format/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "clawhdf5-format"
-version = "2.4.0"
+version = "2.5.0"
 edition = "2024"
 description = "Pure-Rust HDF5 binary format parsing and writing — no C dependencies"
 license = "MIT"
@@ -25,7 +25,7 @@ pco = { version = "1.0", optional = true }
 [dev-dependencies]
 serde_json = "1"
 criterion = { workspace = true }
-clawhdf5-derive = { path = "../clawhdf5-derive", version = "2.4.0" }
+clawhdf5-derive = { path = "../clawhdf5-derive", version = "2.5.0" }
 
 [[bench]]
 name = "bench"