Follow-up on the cherry-picked #82644: the (st_dev, st_ino) snapshot of
site-packages does not survive contact with ext4 — a recreated directory
routinely REUSES the freed inode, so the exact reported repro
(rm -rf venv && uv venv) passed the intact check undetected. Proven live
during salvage: the E2E's replaced venv came back with the identical
inode and runtimeIntact stayed true.
Primary identity is now a marker file written into site-packages when
the SSH owner nonce activates: it deterministically dies with the old
tree on ANY replacement (same or different Python version) and survives
in-place pip/uv installs (no false stales). The stat snapshot remains as
the fallback for read-only site-packages, where it still catches
cross-device moves and version-bump path changes. Client classifier
semantics unchanged: only an explicit runtimeIntact:false rejects, so
older remotes stay compatible.
Three new tests: recreated-venv-with-reused-inode (the live-proven
case), in-place-install stays intact, read-only fallback arms the stat
tier.
Teknium
cddb908aab