Interpret the claw's 3800-unit release scalar per 10 ms physics substep rather
than per 30 ms animation frame. This removes a factor-of-three slowdown from all
four random terminals and restores terminal 18 to raw `(0,1000)`.
Add exact assertions for positions and raw velocities of terminals 1, 6, 7,
and 18, backed by repeated live original captures through release and the first
three gravity substeps.
Test Plan:
- `cargo test --all-targets` -- 48 passed
- `cargo clippy --all-targets -- -D warnings` -- passed
- `cargo build --profile production` -- passed
- all four live original terminal trajectories matched
- `git diff --cached --check` -- passed
ddidderr
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