XERJ v1.0.0-rc.4 — the production-hardening release

XERJ v1.0.0-rc.3 — neural embedder built into the single binary (--em…

…bed-mode neural, auto-downloads); all-way + autoindex-neural recipes

xerj v1.0.0-rc.2

Second release candidate. Rolls up 42 commits since rc.1:
- feat: zero-config autoindex subcommand (folder -> searchable, in place)
- fix(storage): WAL-shard pinning + merge-drop safety + aged WAL-tail durability

xerj v1.0.0-rc.1 — re-cut: XERJ startup-banner fix + current main (al…

…l gated)