feat(11-01): add the conga job framework on River with transactional dispatch

- Pin River v0.47.0 (riverdatabasesql, rivertype) and tidy the example modules
- lagoon.Migrate runs the summercms.conga set: River schema v7 and summer_jobs
  with the apparatus columns plus an internal river_job_id link
- conga.Manager.Dispatch writes the summer_jobs row (status IN_PROGRESS) and the
  River job on the caller's *sql.Tx; a rollback leaves neither
- conga.Job wraps typed job functions so plugins never import River
- conga.StartWorker runs one client on riverdatabasesql.NewWithPgxListener with
  a single-connection LISTEN pool; the final failed attempt sets ERROR
- TestListenPickupLatency: 30s poll, pickup under 1s; poll-only control 2s miss

go.sum

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@@ -327,11 +348,7 @@ google.golang.org/grpc v1.79.3/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhH
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