COMTRADE: smooth scrubbing across analysis workspaces

[masarray]

Goal

Make COMTRADE interaction feel continuous, light and responsive across Time Signals, Phasor, Harmonics and Locus without adding input latency, native-analysis backlog, or presentation state that can override authoritative engineering values.

What changed

• Time Signals: preserve the active P1D3 retained-mode hot path: synchronous cursor TranslateTransform updates and transform-only pan preview. Heavy waveform geometry is not rebuilt during normal scrub, so no artificial cursor lag is added.
• Phasor: exact native vectors remain authoritative targets. Presentation vectors ease continuously on CompositionTarget.Rendering with frame-rate-independent shortest-angle interpolation, bounded settle time, then snap exactly to the native target.
• Harmonics: exact native spectra remain authoritative targets. Prepared row buffers are reused; composition frames update numeric presentation state only, with bounded easing and exact final convergence.
• Locus: native cursor calculation remains latest-only and one-worker-in-flight. R-X marker coordinates ease only in the transient presentation layer at composition cadence; static trajectories remain cached. PRI/SEC changes reset the presentation state first so values from different engineering bases are never interpolated together.
• Frame pacing: presentation elapsed time is bounded so a temporary UI stall cannot create a giant jump; settle tolerance stops pumps once the exact target is reached.
• Tests: regression coverage locks the composition-clock animation contract, reusable harmonic buffers, frame-time bounding and settle tolerance.

Performance / correctness contract

• Pointer/cursor state remains immediate and authoritative.
• No animation queue; latest target wins.
• At most one native analysis worker per existing scheduler.
• No extra native analysis solely for easing.
• No periodic work after presentation settles.
• First sample/topology changes snap instead of inventing motion from unrelated state.
• COMTRADE engineering calculations and native ArdIrec authority are unchanged.

Gate

Merge only after the exact PR head passes application build/test, COMTRADE integration, installer/runtime smoke, and applicable evidence workflows.

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