Retain archives through extraction, verification and publication so failed
or paused installs can retry. After success, delete only the package's
archives while holding the store lock. Normal installs commit facts first.
Cross-target staging follows the same cleanup rule.
Keep unrelated archives and resumable partials. Docker uses this PM behavior
without a separate cleanup command. Later repairs may need a new download.
Verified 64 focused PM tests and 9 Docker tests. Failure-injection tests
cover extraction, verification, publication and facts writes. The rebuilt
linux/amd64 image contains no archives in any layer and remains 1.073 GB
compressed. Real Chromium navigation, clicks and screenshots pass.
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