a8d0138d8b1341ab73421a6474dba529b0319bc1
Captures the post-handoff-56 arc: H1 (ADR-0019) verified already shipped (not "partial"); build-hygiene fixes (incremental off, line-tables debug, cargo-sweep) cutting target/ from 38 GB to ~1.6 GB; and consolidating 25 integration crates into one `it` binary (disk win, not the predicted speed win). Flags the new test layout (add tests under tests/it/ + a mod line) and points the next session at H1a (ADR-0021) as the queued job.
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