feat(compact-basic): baseline compaction backend (squashed from compact-basic)

Collapses the per-round review churn of the prior compact-basic branch into a
single clean baseline on top of compact-interface, so the upcoming retention
refactor lands as fresh, well-scoped commits rather than stacking on a history
of fixes that are being superseded.
This commit is contained in:
Hypatia May
2026-06-25 17:30:42 +08:00
parent 4c1b7191f3
commit aa9afcefc7
23 changed files with 2628 additions and 27 deletions
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