The first draft banned the literal /NF-1/ anywhere in the block, but the
explanatory comment legitimately references 'NF-1' to document the off-by-one
root cause. Match the COL_COUNT awk assignment specifically so the structural
guard targets the executable formula, not the prose.
Replaces the removed prose-regex test (bug-3805-*) that let the off-by-one
ship green. Extracts the actual bash block deployed in fast.md's log_to_state
step and EXECUTES it against real STATE.md fixtures, asserting on the
filesystem result: a row is appended with a cell count matching the header for
both the 5-column (non-validate) and 6-column (validate) schemas, and an
unrecognized schema still skips with a warning.
