Audit of all 41 settings found 3 that were shown but read nowhere, and 17 Boolean
toggles that couldn't be turned OFF.
- Remove grace_period_minutes (orphaned by the schedule-driven cron rewrite) and
weekly_overtime_threshold (never implemented): field + view + seed.
- enable_ip_fallback now actually gates _verify_location's IP-whitelist check
(default ON to preserve current behaviour).
- All 17 fusion_clock Boolean settings now persist explicitly as 'True'/'False'
via a _FCLK_BOOL_PARAMS loop in get_values/set_values (config_parameter Booleans
can't store False, so OFF never stuck). Add round-trip tests. Bump 3.15.2 -> 3.16.0.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
