refactor(planning): remove the original decision trace

docs/planning-duration.md

@@ -79,13 +79,12 @@ The existing initial calculation falls back to the start of `startCalculation`.
 The endpoint is Angular's `afterNextRender` callback after the complete plan has
 been projected into the calendar, its months and placements have been rendered,
 and the loading overlay has been removed. This measures request scheduling,
-calendar preparation, worker startup, search, trace capture that delays the
-outcome, outcome transport, projection and Angular rendering. It is a DOM
+calendar preparation, worker startup, search, outcome transport, projection and Angular rendering. It is a DOM
 readiness endpoint, rather than a claim to measure a physical screen's paint.
 
 Neither core `planningWorkMs` nor artifact timings supply the calibration
-measurement. The callback does not wait for the explanation or trace promises;
-later delivery, navigation and trace errors never add a second measurement.
+measurement. The callback does not wait for the explanation promise;
+later delivery, navigation and explanation errors never add a second measurement.
 Cancellation (including a retained incumbent), incomplete outcomes, invalid
 inputs, conflicts and calculation errors do not calibrate successful-plan
 waiting time. Superseded calculations and callbacks for destroyed calendars
@@ -98,12 +97,12 @@ timer, date adjustment or new calculation. **Cancel** remains explicit.
 
 Controlled-clock tests at the existing calendar and input seams cover initial
 estimation, unsubmitted edits, minute formatting, local refinement, request
-scheduling, a twenty-second calculation exceeding its initial range, a trace
-that fails five minutes after calendar readiness, cancellation with and without
+scheduling, a twenty-second calculation exceeding its initial range, an explanation
+that arrives after calendar readiness, cancellation with and without
 an incumbent, incomplete/error outcomes and superseded calculations. No timing
 assertion depends on CI hardware speed. Existing settings, planner and worker
-tests cover saved horizons, long calculations and original interrupted traces.
+tests cover saved horizons, long calculations and interrupted-plan explanations.
 
 Rendered annual, two-year and three-year references, with the actual displayed
-range and separate later trace wait, are recorded in
+range and historical artifact-delivery wait, are recorded in
 [the benchmark report](benchmark/README.md).