voyager 3: the window in the Rust edge

The indexer finishes files and releases by posting time instead of the
range path: the frontier is the median Date of the last 1,024 plausible
dates (within 7 days of it; a run of 1,024 agreeing dates moves it), and
a release is finished, judged and written once the frontier is 24 h past
its last part, flagged edge when posted within a day of the block's start.
At the block's end the rest is written provisionally as edges for the
block merger. Files short of parts stay in their release (partial: the
store writes complete = false). Gone: fragments and the cut-off,
uploads_of (online now), check.ts and the fixture comparison; CI replays
the fixtures through edge-bench instead. The wire carries finished, edge
and partial.

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

lib/edge/range_indexer.ts

@@ -31,8 +31,10 @@ export interface ReleaseChunk {
    * later chunk of the same release key (the totals then are the release's; the payload only the files not sent yet).
    */
   finished?: boolean
-  /** Still open at its block's end: the block merger joins it with the neighbour block's part. */
+  /** Still open at its block's end, or posted within the window of its start: the block merger joins it with the neighbour block's part. */
   edge?: boolean
+  /** A file of the release misses parts (the window closed on it): not complete, whatever the counter says. */
+  partial?: boolean
   payload: Buffer
 }
 
@@ -95,7 +97,8 @@ export interface EdgeBatch {
   samples: DroppedChunk[]
   candidates: ProbeCandidate[]
   counts: RuleCount[]
-  fragments: Fragment[]
+  /** The range path's cut-off files (the TypeScript indexer); the Rust edge's window has none, the store ignores them. */
+  fragments?: Fragment[]
 }
 
 export interface RangeIndexerOptions {
@@ -210,7 +213,7 @@ export class RangeIndexer {
 
   /** Files completed and fragments cut since the last take: how big the next batch is. */
   get pending(): number {
-    let files = this.batch.fragments.length
+    let files = this.batch.fragments!.length
     for (const list of this.completed.values()) files += list.length
     return files
   }
@@ -294,7 +297,7 @@ export class RangeIndexer {
         fragment.segments.push([s.number, s.messageId, s.bytes, s.articleNumber])
         if (Number.isFinite(s.postedAt) && (fragment.postedAt === null || s.postedAt < fragment.postedAt)) fragment.postedAt = s.postedAt
       }
-      this.batch.fragments.push(fragment)
+      this.batch.fragments!.push(fragment)
     }
   }