fix(security): use p.isWithin for archive extraction bounds - #404
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Closes #401 — shared archive_path_guard replaces startsWith checks in marketplace, sideload, and updater extract paths.
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Summary
archive_path_guard.dartwithisArchiveExtractPathWithinRootandisArchiveEntryNameSafestartsWith(root)checks in marketplace, sideload, and updater extract paths/tmp/abcvs/tmp/abcd)Closes #401
Test plan
flutter test test/core/security/archive_path_guard_test.dartflutter test test/core/extensions/local_extension_installer_test.dartflutter test test/core/updater/update_platform_installer_test.dart