6bdf800a11
Replicates `TaskRun.planType` into the `task_runs_v2` ClickHouse table so run analytics can group by plan type. Adds a `plan_type` column (goose migration `033`, `LowCardinality(String)`), the replication insert mapping, and the matching schema/column/type entries - same shape as the recent `region` addition. Write-once at trigger, so it just rides along on existing replicated rows. Internal analytics only; not exposed in the Query API.