TAM builder (enumerate, then prove coverage)

The insight: a TAM is a coverage claim, and the surface will not sell you one — it sells rows. The two things a market size actually needs are a population count and a reliable identity, and neither exists here:

• Count-mode queries are forbidden. The search grammar's own policy is "never use count-mode clauses" and "never include limit clauses". You cannot ask how many companies match an ICP. The only way to a number is to enumerate the population and count what arrived, which is metered.
• The obvious identity key is polluted. Verified live: a query for one well-known payment processor's domain returned 33 organizations, all carrying that domain, with 28 distinct company ids — micro-businesses and creators whose company page lists a payment link as their website, one of them claiming 10,001+ employees. So domain is a claimed attribute, not a key. Deduping a TAM by domain merges unrelated companies; keeping every id keeps the junk.