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>

commands/coordinator_status.ts

@@ -0,0 +1,22 @@
+import { BaseCommand, flags } from '@adonisjs/core/ace'
+import type { CommandOptions } from '@adonisjs/core/types/ace'
+import StatusService from '#services/status'
+
+/**
+ * What the indexer is doing (app/services/status.ts): the catalog's room, the ranges by band, the last hour's
+ * rates, the held groups and their snapshots, the phase-2 backlogs. Reads only.
+ */
+export default class CoordinatorStatus extends BaseCommand {
+  static commandName = 'coordinator:status'
+  static description =
+    'Prints what the indexer is doing: catalog room, ranges by band, rates, held groups, backlogs'
+  static options: CommandOptions = { startApp: true }
+
+  @flags.boolean({ description: 'JSON instead of the text panel' })
+  declare json: boolean
+
+  async run() {
+    const status = await StatusService.collect()
+    this.logger.log(this.json ? JSON.stringify(status, null, 2) : StatusService.render(status))
+  }
+}