Closes the tamper-evidence loop with two trust anchors the attacker can't
forge from userland:
- pkgdb Layer 2: verify on-disk files against the .MTREE in the *signed*
cache package, surviving a rewritten local checksum DB. Rotating-sample
cadence keeps it affordable; flags pkg_signature_mismatch (sid 100027)
and SigLevel downgrades (sid 100026). Fixes parse_mtree, which required
type=file on every line and so matched nothing on real pacman MTREEs
(which use a /set type=file default with bare file entries).
- rootcheck: anti-rootkit cross-view — hidden processes, modules, ports,
and promiscuous interfaces, each caught by diffing two views of the
same state (sids 100022-100025).
Wired both through config, the daemon (off-loop slow cadence), and CLI
(pkgdb-verify, rootcheck). 14 new tests (95 total). Docs + version bump.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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