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End-to-end plumbing for LockdownAuth.max_session_seconds (per-boot uptime cap on the unlocked session; 0 = unlimited). Wire: - CommandSenderImpl populates LockdownAuth.max_session_seconds in the outbound admin packet (clamped non-negative). Coordinator + persistence: - LockdownCoordinator.submitPassphrase gains optional maxSessionSeconds (default 0); persisted alongside boots/hours and replayed by auto-unlock so cached sessions keep the operator's cap on reconnect. - StoredPassphrase gains a new field with a default of 0 so existing call sites stay source-compatible. - LockdownPassphraseStore (Android EncryptedSharedPreferences impl): reads/writes the new field with a `_maxSessionSeconds` key suffix; legacy entries decode to 0. - LockdownPassphraseStore (JVM file-backed impl): bumps the per-entry on-disk serialization from 3-line to 4-line; legacy 3-line entries still decode (treated as maxSessionSeconds=0). IPC + radio plumbing: - IMeshService.sendLockdownUnlock AIDL gains a 4th int parameter. - MeshService stub, MeshActionHandler, RadioController interface, and both impls (AndroidRadioControllerImpl, DirectRadioControllerImpl) thread the field through. - FakeIMeshService, FakeRadioController, FakeLockdownCoordinator updated to match. UI: - LockdownDialog adds a single optional "Session cap (minutes)" field below the boots/hours row. Operators enter minutes for ergonomics; the dialog multiplies by 60 before passing to the coordinator. Blank or 0 = unlimited (firmware default). - UIViewModel.sendLockdownUnlock gains the new param with default 0. - New string resources: lockdown_session_minutes, lockdown_session_minutes_help. Strings re-sorted via scripts/sort-strings.py. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>