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[FRAMING] Use a marker sequence instead of an all-ones blast to denote beginning and ending#4

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benhg wants to merge 4 commits intomainfrom
ben/switch-to-preamble
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[FRAMING] Use a marker sequence instead of an all-ones blast to denote beginning and ending#4
benhg wants to merge 4 commits intomainfrom
ben/switch-to-preamble

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@benhg benhg commented Jul 18, 2025

We have noticed a lot of problems with detecting the beginning or end of a sequence. This PR:

  1. Adds four characters (MARKER_1 -> MARKER_4) to the alphabet
  2. Uses them in the order of 1234 for the preamble
  3. Uses them in order of 4321 in the postamble
  4. Searches for them and syncs based on them in the decode path

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