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>

edge/bench-fixtures.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+# The Rust indexer over the committed captures (edge/fixtures: 25k overview lines each of a.b.ath, a.b.boneless,
+# a.b.fta and a.b.models, in 5 chunks): a smoke test of the window on real headers, exiting non-zero when the bench
+# fails on one. CI runs it after cargo test; run it from the repository root after a change to the indexer.
+set -eu
+cd "$(dirname "$0")/.."
+cargo build --release --quiet --manifest-path edge/Cargo.toml --bin edge-bench
+for capture in edge/fixtures/*/; do
+  echo "== $(basename "$capture")"
+  edge/target/release/edge-bench "$capture" --batch-chunks 2 --idle 2 | tail -1
+done