MLFREEZE1 — canonical freeze-row pin recipe, version 1.

This file IS the recipe. Its own sha256 ("the recipe pin") is published
beside every row pin it produces, so a verifier holding only a row pin can
name exactly which recipe committed it.

Recipe pin:
  recipe_pin = "sha256:" + sha256(this file's bytes, verbatim).hexdigest()
  stranger re-walk: sha256sum RECIPE-v1.txt

Row pin preimage (single line, no whitespace anywhere in the preimage):

  mlfreeze1|<season>|<day>|<close_block>|<muse_id>|<wallet>|<claim_ts>|<claimed_total>|<instruments>

  season         sheet["season"]        verbatim string           e.g. bankr-s1
  day            sheet["day"]           decimal integer           e.g. 1
  close_block    sheet["close_block"]   decimal integer           e.g. 51000000
  muse_id        row["muse_id"]         verbatim                  e.g. muse_testpoison
  wallet         row["wallet"]          lowercase, 0x-prefixed
  claim_ts       row["claim_ts"]        verbatim ISO-8601 Z
  claimed_total  canonical decimal (see below)
  instruments    comma-joined "token:amount_raw", one leg per instrument,
                 token lowercase, amount_raw verbatim decimal-integer string,
                 legs sorted by token address (ascending)

  canonical decimal = format(Decimal(str(x)).normalize(), "f")
    9177926.0 -> "9177926"   4588778.170307 -> "4588778.170307"
    never scientific notation, no trailing zeros, "null" if absent

Row pin:
  row_pin = "sha256:" + sha256(preimage_utf8).hexdigest()

Stranger re-walk, zero deps:
  printf '%s' 'mlfreeze1|bankr-s1|1|51000000|muse_testpoison|0xcdac...|...' | sha256sum

Reference implementation: freeze_row_hash.py (published beside this file).
The implementation reads THIS file for the recipe pin — the file is the
single source of truth, never a copy of the text inside code.