Replace fixed Linux Hopper release pins with current vendor feed metadata,
complete detached-PGP package verification under the stable publisher primary
key, and authenticated package evidence for offline admission. Share parsed
publisher facts across approved setup, doctor and the pre-execution guard.
Preserve existing ownership, cancellation, private-display and cleanup rules.
Fixes#3577
Normalize empty XDG settings, preserve backups during approved cache repair,
and retain publisher cleanup through cancellation and shutdown. Exercise cold
offline verification without reusing process-local proof state. Serialize
approved cache publication across processes, restore old evidence on failure,
and share the existing lease owner from process without changing its identities.
Validation: 438 focused tests (six platform-related skips), full static/documentation checks, real Ubuntu
24.04 official Hopper 6.6.0 setup/CLI/MCP, offline ordinary-user admission,
launcher mutation rejection, and cold/warm verification measurements. Official
RPM metadata mismatch is tracked separately in #3578 and fails closed.
BREAKING CHANGE: Older Linux Hopper builds admitted by the fixed allowlist
now require retained publisher-signed package evidence or an approved update
to the current public demo. Update explicit HOPPER_LAUNCHER_PATH values when
migrating; the live feed exposes only its current release.
Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>
Co-authored-by: gensokyo-dev <342580529+gensokyo-dev@users.noreply.github.com>
