When a schedule entry has `exclusive: true`, the scheduler stays on that
entry's bookmark for the entire time window without interleaving with
other overlapping entries. Useful for WEFAX and satellite passes where
switching away mid-reception would lose data.
Backend: first exclusive active entry wins outright in timespan_active_entry.
Frontend: "Excl." checkbox in inline edit disables interleave input;
interleave status shows exclusive entry as sole active entry.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
sjg
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