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vac-optimizer/docs/adr/0003-constraint-first-lexicographic-planning.md
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# Constraint-First Lexicographic Planning Without a Solver Dependency
VacOptimizer resolves obligation rules exactly and jointly, then applies deterministic heuristic stages for at-risk loss, ordered preferences, calendar gain, work-sequence quality, supporting placements, balance expiry, and dates in that order; a completed plan does not claim mathematical global optimality. The dependency-free planner targets five seconds, returns `PlanningIncomplete` if those stages are interrupted, and stops after ten seconds. A HiGHS WebAssembly spike missed that hard limit on representative inputs even on the development machine, so no solver dependency is accepted. This supersedes ADR 0001.