Rebuild: first end-to-end runs; prefetch per chunk, executable rule, wire fixes

End to end on the workstation (coordinator:run, the API, edge:node, real
NNTP): a.b.e-book.french and a.b.cd.image.playstation2.dvdiso ranges.

- Prefetcher: every connection takes the next missing chunk (leased
  ranges first, in order); one connection per range (~26k lines/s) kept
  the worker waiting
- executable rule: releases of bare executables (malware floods named
  after films and software) are dropped; they were 92% of the catalog rows
  of the test ranges, 21% of the segments
- fragments per file (details once) and gzipped batch bodies; the JSON
  limit (1 MB by default) raised to 256 MB, empty strings kept (a rule
  count's key is '')
- release_chunks.batch_from is a bigint (boneless article numbers)
- tests get their own database; edge:bench --store times BatchStore:
  1.3 s for a boneless range (1.24 ms per release chunk)

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

tests/unit/rules/rule_set.spec.ts

@@ -21,6 +21,12 @@ test.group('rules / verdicts', () => {
     assert.deepEqual(rules.judge('k', [file('Hs7dKq2LmZ9xWv3RtYp1Qa.part01.rar', 50, NGPOST), file('Some.Show.S01E01.1080p.nfo', 1, NGPOST)]), { rule: null })
   })
 
+  test('bare executables are dropped, sidecars aside; an executable among other content is kept', ({ assert }) => {
+    assert.include(rules.judge('k', [file('How to Make Love to a Woman 2010.scr', 10, NYUU), file('How to Make Love to a Woman 2010.par2', 1, NYUU)]), { rule: 'executable', key: 'scr' })
+    assert.include(rules.judge('k', [file('Adobe Illustrator CS2 + ssg keygen.zip  .exe', 3, NYUU)]), { rule: 'executable', key: 'exe' })
+    assert.deepEqual(rules.judge('k', [file('Some.App.v1.0.part1.rar', 50, NYUU), file('setup.exe', 2, NYUU)]), { rule: null })
+  })
+
   test('random names: per-article with few parts, garbage by tool or signature, else kept', ({ assert }) => {
     assert.include(rules.judge('k', [file('Hs7dKq2LmZ9xWv3RtYp1Qa', 2, NYUU)]), { rule: 'per-article', key: 'nyuu' })
     assert.include(rules.judge('k', [file('Hs7dKq2LmZ9xWv3RtYp1Qa.part01.rar', 50, NGPOST)]), { rule: 'garbage', key: 'ngPost alt.binaries.ath' })