fix(cli): enrich-agencies reports distinct rows, not upsert counts (#142)

[alexwolson]

Closes #142.

The bug

tb enrich-agencies printed the number of upserts issued as though it were the table's
contents. The tables dedup on (buyer_id, native_ref) and the award line key — a report and its
amendment, or two items sharing a fallback ref, collapse into one row — so a reader who saw
107 solicitations went looking in the DB and found 74.

The dedup is correct and intended. Only the messaging was wrong.

The fix

Took the issue's first option: report distinct rows. The leading figures now come from two
real row-count queries. #177 already made the delta honest this way; this is the same
correction applied to the totals sitting beside it.

The upsert counts are kept, in a trailing bracket that names them for what they are —
0 upserts and 107 upserts that all deduped are very different runs, and a flat (+0) alone
cannot tell them apart. That diagnostic would have been lost by simply swapping the numbers out.

_source_row_counts gains solicitations (it counted awards/bids only), so all three figures come
from the same source-scoped query rather than mixing sources.

Verification

Run against a copy of the production store, with every figure checked independently against the
DB:

trca stored : 225 solicitations (+0), 439 awards (+0), 408 bids (+0)  [upserts 446/693/527]
zoo stored  : 46 solicitations (+0), 53 awards (+0)                   [upserts 58/58]
ep stored   : 74 solicitations (+0), 88 awards (+0), 115 bids (+0)    [upserts 107/107/115]

trca_board   DB rows: 225 solicitations, 439 awards, 408 bids
zoo_board    DB rows: 46 solicitations, 53 awards, 0 bids
ep_board     DB rows: 74 solicitations, 88 awards, 115 bids

Exact match on all nine figures. EP is the 107-vs-74 case from the issue — and the gap turned
out wider than reported: TRCA was claiming 446 solicitations for a table holding 225.

778 tests passing — 2 new (distinct-rows-not-upserts; the dedup that causes the gap, pinned
directly by upserting two rows under one native_ref and asserting one row results), and 4
updated to the widened 3-tuple _source_row_counts contract.

🤖 Generated with Claude Code

https://claude.ai/code/session_01W53WHx8mm2UHuLFAQWeF62