docs: the reseq probe's readings, and the invariants resequencing changes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

todo.md

@@ -2,13 +2,14 @@
    1. the antialisaing strategy with phosphore effect should be applied with more stregth
    2. the lines should be more tick
    3. the sample points should be bigger
-2. relative timing:
+~~2. relative timing:
    - in order to avoid problem with time jitter user can decide to go in relative time mode
    - in this mode absolute signal time is only use for export
    - the plot time depends just on signal sample rate and frame number, e.g.:
      - user is acquiring a signal with 1MSps and 100_000 samples per udp frame
      - last frame as number <N> and previous <N-2> in this case a 100_000 indexes must be skipped
-     - time is simply: `((<N_frame> - <N_last>) * <n_samples_per_frame> - <sample_index>) / <sample rate>` (or something like that)
+     - time is simply: `((<N_frame> - <N_last>) * <n_samples_per_frame> - <sample_index>) / <sample rate>` (or something like that)~~
+   done: `--relative-time`; see README and SPECS.md for the measured history cost.
 3. named configurations: in order to have multiples configurations for the same sources configuration can also have comments
 4. optional udp frame storage for debugging of strange behaviours (store last <N>, default = 1000, udp packets binary content on disk for forensic analyss)
 5. open exported binary waveforms to view/analyse, in the source selection dialog there should be the option to open exported waveform (maybe a tab with latest opened file and option to open new ones?)