feat(quickadapter): configure the exit-stage fraction series (#286)

feat(quickadapter): configure the exit-stage fraction series (#286)

* feat(quickadapter): configure the exit-stage fraction series

* fix(quickadapter): use integer-power retracement ladder

* fix(quickadapter): correct the exit-stage ladder documentation and guards

* fix(quickadapter): bound the ladder base and index rungs by stage

* refactor(quickadapter): name the ladder after natr_multiplier_fraction

* test(quickadapter): restore partial exit regression guarantees

* test(quickadapter): avoid pinning diagnostic wording

* refactor(quickadapter): align take-profit extension terminology

* test(quickadapter): avoid pinning private diagnostic presentation

* feat(quickadapter): default final retracement fraction to 0.5

* refactor(quickadapter): consistently access static exit stage settings

* docs(quickadapter): keep exit fraction documentation in the configuration table

* chore(quickadapter): bump version to 3.13.0-rc.14

* fix(quickadapter): harmonize exit-pricing diagnostics

* docs(quickadapter): remove incidental startup log detail

* fix(quickadapter): report effective startup configuration

* fix(quickadapter): deduplicate startup horizon warnings

* docs(quickadapter): focus option descriptions on user behavior