ci: lint all targets, run interop suites for real, compile benches

- clippy --all-targets plus a clawhdf5-format feature matrix (parallel, lz4,
  zstd, pcodec, fast-checksum); fix the accumulated lint backlog in test,
  bench and feature-gated code (no behaviour changes).
- Install python3 + h5py/numpy/netCDF4/xarray in the CI container and set
  CLAWHDF5_REQUIRE_INTEROP=1, which makes a missing interop dependency a test
  failure. Every h5py/netCDF4 interop test used to skip silently in CI. Run
  the #[ignore]d writer_h5py_tests suite explicitly.
- cargo bench --no-run so benches can't rot; fix bench.rs and memory_bench.rs,
  which no longer compiled against the current strategy/consolidation APIs.
- Optional fuzz smoke run via CLAWHDF5_FUZZ_SECONDS.
- CHANGELOG and docs/known-issues.md updated.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

crates/clawhdf5-format/src/data_read.rs

@@ -1763,11 +1763,11 @@ mod tests {
     fn f16_bits(v: f32) -> u16 {
         // Encode a few exact values used by the test.
         match v {
-            x if x == 0.0 => 0x0000,
-            x if x == 1.0 => 0x3c00,
-            x if x == -2.0 => 0xc000,
-            x if x == 0.5 => 0x3800,
-            x if x == 65504.0 => 0x7bff, // f16 max
+            0.0 => 0x0000,
+            1.0 => 0x3c00,
+            -2.0 => 0xc000,
+            0.5 => 0x3800,
+            65504.0 => 0x7bff, // f16 max
             _ => panic!("unsupported test value {v}"),
         }
     }
@@ -2186,7 +2186,7 @@ mod tests {
             ],
         };
         let mut raw = Vec::new();
-        raw.extend_from_slice(&3.14f64.to_le_bytes());
+        raw.extend_from_slice(&3.25f64.to_le_bytes());
         raw.extend_from_slice(&42i32.to_le_bytes());
 
         let field = read_compound_field(&raw, &dt, "id").unwrap();