refactor(quickadapter): centralize exit_pricing and reversal_confirmation validation...

refactor(quickadapter): centralize exit_pricing and reversal_confirmation validation (#125)

Fold trade_price_target_method and reversal_confirmation inline validation onto the declarative spec-table pattern (get_exit_pricing_config, get_reversal_confirmation_config); coupled min/max NATR pair kept on validate_range. Remove the vestigial default_reversal_confirmation ClassVar. Guard np.isfinite via a shared _is_finite_value helper so every numeric validation path is total (no raise on ints >= 2**64 or non-scalar input). Cache config-derived validation properties (cached_property) in the strategy and regressor. Behavior preserved for all realistic inputs.