fix(clippy): achieve zero warnings across entire workspace
- Fix format_push_string: write!() instead of push_str(&format!()) (25 sites)
- Fix str_to_string: .to_owned() instead of .to_string() on &str (6 sites)
- Fix unseparated_literal_suffix: add _ separator (6 sites)
- Fix multiple_inherent_impl: merge split impl blocks in TGGN, TFT, OFI (3)
- Fix else_if_without_else: add exhaustive else clauses (3 sites)
- Fix if_then_some_else_none: use .then().transpose() (1 site)
- Fix unwrap_in_result: replace expect() with match + ? (2 sites)
- Fix wildcard_enum_match_arm: enumerate Storage variants explicitly (2)
- Fix decimal_literal_representation: use hex for power-of-2 constants (5)
- Fix rc_buffer: Arc<Vec<T>> → Arc<[T]> for OFI features
- Fix needless_range_loop: convert to iterator patterns (17 sites)
- Fix used_underscore_binding: remove prefix on used vars (6 sites)
- Fix doc list item indentation (7 sites)
- Allow too_many_arguments on ML training functions (4)
- Allow multiple_unsafe_ops_per_block on CUDA FFI functions (3)
- Allow upper_case_acronyms on SLSTM/MLSTM model names (2)
- Add ML-crate pedantic allows: shadow, similar_names, type_complexity,
indexing_slicing, partial_pub_fields, non_ascii_literal, same_name_method
(following existing ml-labeling/ml-universe pattern)
Result: cargo clippy --workspace -- -D warnings passes with zero warnings.
All 2758+ lib tests pass (2 pre-existing backtesting failures unchanged).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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