wboayue / fusion-ahrs / #36

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feat(ahrs)!: sync with upstream Fusion C a8d7224 + C comparison tests (#40)

- sample_rate setting + set_sample_period; update() drops delta_time
- rejection_timeout (s) replaces recovery_trigger_period (samples)
- flags renamed startup / overrange_recovery; add restart, skip_startup; deprecate initialise/reset
- port upstream fixes: overrange output preservation, startup ramp, residual
- Display/as_str + ALL for Convention and AxesAlignment; Ahrs derives Debug, Clone
- fusion-c-sys test crate + per-sample C comparison tests; CI fails on test failures

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