Critical (C1): Added has_permission('security', 'READ') to /health and
/fingerprint endpoints; has_permission('security', 'WRITE') to /recover.
Previously any authenticated user could enumerate encrypted secrets and
overwrite stored values.
High (Bug #1): Fixed recover endpoint — updated/failed status now correctly
reflects whether a non-empty replacement value was submitted. Empty values
now report 'skipped' instead of falsely 'updated'.
High (Bug #2, #3): Replaced all hardcoded English strings in
KeyRecoveryWizard.svelte and SystemSettings.svelte with $t.settings.*
i18n lookups. Keys already existed in en/ru settings.json.
High (H1): Added _sanitize_error() helper to truncate + scrub exception
messages before logging, preventing potential secret leakage in log output.
Cleanup: Moved LLMProviderConfig import to module top. Instantiate
ConnectionService once before for-loop. Added @TEST_EDGE declarations
and @PRE/@SIDE_EFFECT to C4 contract.
Tests: 226 passed