Converge hook writes onto the ingest statement path

axctl has two graph-write paths: ingest builds SurrealQL UPSERT/RELATE statements and executes them in chunks; hooks call db.upsert() one row at a time via writeTelemetryRow. ADR-0004 makes Harness Hook Events first-class Local Evidence, so the hook path is load-bearing, not incidental.

Two write paths means new telemetry tables have no canonical pattern. We converge: writeTelemetryRow builds an UPSERT statement using the shared surql.ts literal toolkit and runs it through the shared statement executor - the same seam ingest uses. db.upsert / db.relate remain on SurrealClient as escape hatches but are no longer the telemetry write path.

Consequence: one write path, one place escaping/record-id rules live, and hook evidence rows are built and tested the same way as ingest evidence rows.