Merge branch 'ps/odb-pluggable-housekeeping' into next

Object database housekeeping in 'git gc' and 'git maintenance' has been refactored to be pluggable. The files-backend-specific logic, including incremental and geometric repacking as well as object pruning, has been moved out of the command implementation and into the files object database source, enabling future alternative object database backends to implement their own housekeeping services. * ps/odb-pluggable-housekeeping: odb: make optimizations pluggable builtin/gc: fix signedness issues in ODB-related functionality builtin/gc: refactor ODB optimizations to operate on "files" source builtin/gc: introduce `odb_optimize_required()` builtin/gc: move geometric repacking into `odb_optimize()` builtin/gc: introduce object database optimization options builtin/gc: inline config values specific to the "files" backend builtin/gc: make repack arguments self-contained builtin/gc: extract object database optimizations into separate function builtin/gc: move worktree and rerere tasks before object optimizations odb: run "pre-auto-gc" hook for all maintenance tasks t7900: simplify how we check for maintenance tasks