The namer re-reads partial releases as the Rust window writes them

The pending namer's TypeScript re-index gave a file short of parts on the
server to the range path's fragment rule, so a partial release the edge
wrote (Bob's hex-named uploads in chello, ratcave, font, storage) never came
out again: 10 of 148k named releases moved. RangeIndexer's partialFiles
keeps such a file in its release, marked partial; tools/namer_check.ts
replays sample rows from the corpus (10 of 10 found with it, 1 without).

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

tests/unit/edge/range_indexer.spec.ts

@@ -87,6 +87,24 @@ test.group('edge / RangeIndexer', () => {
     assert.deepEqual(batch.counts.map((c) => [c.rule, c.articles, c.files]), [['incomplete', 2, 1]])
     assert.lengthOf(batch.releases, 0)
   })
+
+  test("partialFiles: a file short of parts is a partial release, as the Rust window writes it; one article of a random multi-part file isn't", ({ assert }) => {
+    const indexer = new RangeIndexer({ group: GROUP, start: 100, end: 200, rules, idleChunks: 0, edgeArticles: 0, partialFiles: true })
+    const name = '8c21f5c36450f9e2ccc6ff387d159d4d'
+    indexer.add([
+      // Parts 1, 3 and 5 of 6 (the others gone from the server), from a re-send's copy of part 3 too.
+      ...post(100, name, 6, { poster: 'Bob <bob@home.me>' }).filter((_, i) => i % 2 === 0),
+      ...post(150, name, 6, { poster: 'Bob <bob@home.me>' }).slice(2, 3),
+      ...post(160, 'Pq4ZmXc8VbN2LkJh6GfDs3', 4).slice(1, 2),
+    ], 201)
+    indexer.finish()
+    const batch = indexer.take()
+    assert.lengthOf(batch.releases, 1)
+    assert.include(batch.releases[0], { name, files: 1, segments: 3, partial: true, firstArticle: 100, lastArticle: 104 })
+    assert.deepEqual(decodeChunk(batch.releases[0].payload)[0].segments.map((s) => s[0]), [1, 3, 5])
+    assert.deepEqual(batch.fragments, [])
+    assert.deepEqual(batch.counts.map((c) => [c.rule, c.articles, c.files]), [['per-article', 1, 0]])
+  })
 })
 
 test.group('edge / taking over a range', () => {