The repo was formatted under an older stable; rustfmt 1.9 (Rust 1.95)
wraps signatures and call sites differently, so every touched file was
picking up unrelated formatting hunks. One mechanical pass, and a
'cargo fmt --check' step in the test workflow (same pinned 1.95.0
toolchain) so drift can't accumulate again.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
First increment of the module-split plan: card_plugin.rs becomes
card_plugin/{mod.rs, tests.rs} (2,536 + 1,592 lines), following the
replay_overlay/ pattern. Pure mechanical move via git mv — no runtime
code changes; all 70 tests preserved and passing.
Refs #118
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>