reaction.fr_pairs previously reported n_total equal to n_items (the
matching Response: count, always the same number as the family's pair
count) — it now reports the rule item's TOTAL Comment: paragraph count,
family or not, matching the n_items-out-of-n_total shape the docket
rows already use. _COMMENT_RE/_RESPONSE_RE are tightened to no leading
whitespace and no space before the colon, so they agree exactly with
the LIKE 'Comment:%'/'Response:%' SQL prefilter.
Also moves the code-pattern/code-match helpers pfs.guidance and
pfs.reaction both need (code_pattern/codes_in) into pfs.families next
to find_codes/FR_CITE_RE, as public functions both modules import
instead of reaction reaching into guidance's private names.
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