Rebuild: coordinator (planner, NNTP pool, spool, prefetcher, leases, rule sets), node API and the edge:node worker

- groups:add / ranges:plan / nodes:create / coordinator:run commands
- the node API: lease, the range's chunks as one framed stream from the
  spool, batches, heartbeat, finish, release (node guard, token per node)
- edge:node: needs COORDINATOR_URL and NODE_TOKEN only (placeholders for
  the rest), posts a batch every 10 chunks, gives its range back on SIGTERM
- releases are gathered per batch: 1.04 chunk rows per release at 10
  chunks per batch (1.35 when built per XOVER chunk)
- partitions are checked per batch instead of remembered

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

commands/ranges_plan.ts

@@ -0,0 +1,20 @@
+import { BaseCommand } from '@adonisjs/core/ace'
+import type { CommandOptions } from '@adonisjs/core/types/ace'
+import Planner from '#services/planner'
+import NntpPool from '#services/nntp_pool'
+
+/** Cuts every active group's history (and new articles since) into ranges. */
+export default class RangesPlan extends BaseCommand {
+  static commandName = 'ranges:plan'
+  static description = "Plans ranges for the indexed groups' articles"
+  static options: CommandOptions = { startApp: true }
+
+  async run() {
+    try {
+      const { groups, ranges } = await Planner.planAll()
+      this.logger.info(`${ranges} ranges planned over ${groups} groups.`)
+    } finally {
+      await NntpPool.close()
+    }
+  }
+}