style: clear the fmt gate and two lib clippy warnings

Deferred deliberately while the TWIN-2B/2C campaign had live marches:
each march is a fresh `cargo test` invocation, so reformatting
`turek_hron_fsi2.rs` mid-campaign would have forced a test-binary
rebuild and cost comparability for a cosmetic gate. The family closed,
so this is now free.

- `cargo fmt --all` across 8 files that had drifted (including the
  FSI2/FSI3 harnesses touched by the UMEAN/ES override commits).
- `rtx-feature-store/tests/integration_tests.rs` had trailing
  whitespace rustfmt refused to format around ("left behind trailing
  whitespace" internal error), so the whole file was being skipped;
  stripped it and the file formats now.
- Two `unnecessary_parentheses` warnings in the rtx-transformers lib
  (`continual/progressive.rs`, `curriculum/mod.rs`) — these were the
  only rustytorch warnings surfacing through omni-cortex's workspace
  clippy gate, which is how they were found.

No behaviour change. rtx-fsi test binaries still build.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01B1feFAQxjbCRHePUdxuNra

crates/specialized/rtx-fsi/tests/turek_hron_fsi3.rs

@@ -226,8 +226,8 @@ fn fsi3_added_mass_flag() {
     // (`RTX_FSI3_UMEAN`) or e_s (`RTX_FSI3_ES`) pins nothing here.
     // Machinery invariants above stay asserted at every inflow and
     // stiffness.
-    let benchmark_case = case.u_mean.to_bits() == FSI3.u_mean.to_bits()
-        && case.e_s.to_bits() == FSI3.e_s.to_bits();
+    let benchmark_case =
+        case.u_mean.to_bits() == FSI3.u_mean.to_bits() && case.e_s.to_bits() == FSI3.e_s.to_bits();
     let default_release = benchmark_case
         && config.subcycle == 2
         && config.mask_hysteresis == 0.0