Lease lanes for the tail, a mixed lease order, coordinator:status, the edge end to end

A group now has two lease lanes (migration 6600): `history` works the ranges the bounds hand out, `tail` the tail
planner's, each with its own holder, window, snapshot and takeover redo, so a thread on the tail never wades
through a group's history and a held group's tail isn't stuck behind it. The edge puts `--tail-threads`
(EDGE_TAIL_THREADS, 1 of 2+ by default) of its threads on the tail lane; the group routes take `?lane=`. The
lease order within a lane alternates the group with the most planned articles and the longest unheld one. The
takeover redo puts back only the lane's ranges the window did after the snapshot, and a group whose last range
is held by a holder gone quiet can be taken over.

`coordinator:status` prints the catalog's room, the ranges by band, the last hour's rates, the held groups with
their snapshots and the phase-2 backlogs. `tests/e2e` runs the real edge-node binary against the node API: the
corpus-fill race, a failed stream and the restart that restores the snapshot, a restart without the snapshot
file, a takeover (STREAM_CHUNK_WAIT_MINUTES is a setting now). CI builds the binary before the tests.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

config/coordinator.ts

@@ -41,6 +41,12 @@ export default {
   leasePriorityMin: env.get('LEASE_MIN_PRIORITY', -1_000_000),
   leasePriorityMax: env.get('LEASE_MAX_PRIORITY', 1_000_000),
   leaseCaptureOnly: env.get('LEASE_CAPTURE_ONLY', false),
+  /**
+   * How long a range's stream waits for a chunk the prefetcher hasn't spooled yet (app/controllers/node_controller.ts).
+   * Long: a chunk that keeps coming in isn't given up (only a stalled one is), and some groups' chunks take 20+
+   * minutes (a.b.0day.stuffz, 17 MB in 22 min; LOG.md 2026-10-10 (3)).
+   */
+  streamChunkWaitMs: env.get('STREAM_CHUNK_WAIT_MINUTES', 60) * 60 * 1000,
   /** NNTP connections the coordinator fetches headers with: at most (its share, nntpShares), and at least while sharing. */
   nntpConnections: env.get('NNTP_CONNECTIONS', 4),
   nntpMinConnections: env.get('NNTP_MIN_CONNECTIONS', 8),