feat(planning): make optimization rules composable

Evaluate explicit, ordered optimization configurations through one shared
planner model. Add six editable presets, durable one-time legacy migration,
and consistent completed and cancelled plan provenance.

Include functional regressions and the agreed trace-removal and benchmark
follow-up specs. Performance acceptance remains in #78 under unchanged gates.

Refs: #70, #71, #72, #73, #74, #75, #76, #77, #78

.scratch/remove-original-decision-trace/issues/02-verify-trace-free-planning.md

@@ -0,0 +1,27 @@
+# 02 — Verify integrated planning after trace removal
+
+**GitLab:** [#77](https://gitlab.nessar.fr/nessar/vac-optimizer/-/work_items/77)
+
+Blocked by: #76
+
+## What to build
+
+Demonstrate that the integrated #70–#75 work retains its supported behavior after trace removal. Provide a functionally verified trace-free baseline for #78, which now owns benchmark performance acceptance and optimization. Benchmark performance is no longer a completion gate for #75 or this functional verification ticket.
+
+## Acceptance criteria
+
+- [ ] Review the integrated contract replacement across all calculation paths and UI callers. Confirm there is no trace recorder, trace transport, acknowledgement wait, historical replay API or retained trace-dependent control or compatibility shell.
+- [ ] Compare completed outcomes and stable explanations against existing deterministic fixtures, including typed joint obligations, earned-entitlement chains, custom objective formulas, reordered priorities, two- and three-year horizons and no active optimization rules. Do not rewrite placement expectations to hide a behavioral regression.
+- [ ] Verify real-worker outcome and explanation delivery, heartbeat monitoring, stale-response rejection and explanation failure handling. Exercise cancellation before any valid incumbent and after a valid incumbent, and confirm that partial outcomes remain valid without false conflicts.
+- [ ] Verify displayed-placement alternative-date analysis and remaining-balance reasons without historical data. Check that captured settings remain immutable and hypothetical alternatives do not change the displayed plan.
+- [ ] Run the existing full correctness, coverage, static, formatting and build checks appropriate to the integrated change, and resolve regressions within the trace-removal scope. Preserve the repository's required thresholds.
+- [ ] Complete browser QA for the retained explanation, calendar, cancellation and alternative-date flows, including keyboard interaction and a narrow viewport. Confirm the advanced trace explorer, historical overlays and historical attempt controls are absent.
+- [ ] Verify that benchmark callers use the supported trace-free calculation contract and retain their correctness, determinism, horizon, placement-count and completed-stage assertions. Full protocol execution, the unchanged 2 GB/300-second performance gates and any required optimization belong to #78.
+- [ ] Hand off the functionally verified integrated baseline and unchanged benchmark inputs to #78. Verify retained outcome and explanation delivery without waiting for removed trace artifacts or inventing replacement trace counters.
+- [ ] Keep the original #70–#75 dependency order and report the functional integration result. Apply #75’s revised functional completion criteria: a benchmark performance failure alone does not block #75 or this ticket. Outstanding benchmark requirements remain open in #78, without deadline relaxation or an automatic engine cutoff.
+
+The removal is agreed; its measured speedup is unresolved and is now evaluated in #78. This ticket owns functional verification after trace removal. It does not itself implement performance optimizations or close other issues.
+
+## Blocked by
+
+- #76 — Remove the original decision trace end to end (https://gitlab.nessar.fr/nessar/vac-optimizer/-/work_items/76).