Re: [PATCH v2 0/7] odb: track multi-pack-indices via their object sources

> Changes in v2:
>   - Changed the base of this series. It is now built on top of
>     a30f80fde92 (The eighth batch, 2025-07-08) with "ps/object-store" at
>     841a03b4046 (odb: rename `read_object_with_reference()`, 2025-07-01)
>     and "tb/midx-avoid-cruft-packs" at 5ee86c273bf (repack: exclude
>     cruft pack(s) from the MIDX where possible, 2025-06-23) merged into
>     it.
>   - Re-explain the split between object databases and object sources
>     to help readers out a bit, given that this is a rather recent
>     change.
>   - Rename `struct odb_source::multi_pack_index` to `struct
>     odb_source::midx`.
>   - Fix some overly long lines when looping through the individual
>     sources.
>   - Drop the patch that guards re-loading MIDXs, as we already have the
>     guard via `packed_git_initialized`.
>   - Remove some while-at-it changes to make the diffs easier to read.
>   - Link to v1: https://lore.kernel.org/r/20250709-b4-pks-midx-via-odb-alternate-v1-0-f31150d21331@pks.im