Counterparty Identity Resolver (google/counterparty.ts)

Resolves an open loop's counterparty to a person page, first within its own connector source, then across sources by exact email alias or canonical identity. Reuse for confidence-gated cross-source entity matching.

// Source: https://github.com/garrytan/gbrain | License: MIT | Copyright 2026 Garry Tan
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Counterparty resolution for open loops (#5504, wave 14 P4.1).
 *
 * A loop's counterparty is a person named in a connector source (a Gmail
 * sweep), while the person's page often lives in another source (`default`
 * on a federated brain). Resolution runs in two steps and records the source
 * it landed in, so `open_loops.counterparty_source_id` can confine every
 * later read to one (source, slug) page:
 *
 *   1. the loop's OWN source, through the ordinary resolver, any
 *      high-confidence arm (never the slugify fallback);
 *   2. failing that, ACROSS sources by identity only (T8): the exact email
 *      as a page alias (one

... (truncated -- full source via MCP)