Stability logic update, Operators logic refactor - #77
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…pling - Split fitness into SolverFreeFitness / SolverBasedFitness hosts driving pluggable objective fillers (new operators/common/objectives.py: discrepancy + instability), replacing the metric blocks duplicated across the old fitness operators. - Varying-coefficient stability (gram_mode='vcoef') is the default coefficient-stability estimator (stability.py); sparsity routes through it via PhysicsInformedLasso / VWSRSparsity. - Couple per-equation RPS-state reset to the structure-changing operators (EquationMutation set-based change detection, EquationCrossover, gene swap) instead of OffspringUpdater's blanket reset. - remove_zero_terms compacts weights_internal in lockstep with structure so position-indexed reads stay aligned (fixes text_form render / np.dot crash). - Resurrect single-objective mode (globals.single_objective_metric).
…gnostic - configs: add truth_alternatives (e.g. lorenz degenerate-quadratic w-eq) and per-system fit / moeadd overrides. - run.py / thesis_runner.py: vc-component / anchor-mode / stability config plumbing into build_search. - kdv_sindy_test.py: --system support so multi-equation systems (lorenz, lv, ns) can be seeded and per-term-scored.
One-off CV / vcoef / instability investigation scripts superseded by the current diagnostic harness (kdv_sindy_test.py) and the stability subsystem.
Drop the per-system EPDE discovery-run boilerplate from the data scripts; discovery now runs through the thesis harness (projects/thesis), leaving these as data-generation/loading only.
_equations_share_active_structure is subsumed by target-term uniqueness: full-duplicate equations have distinct targets (each target must contain its own main-var derivative), so each carries the other's target as a standalone term and is broken by the target-uniqueness scan. Removes the guard and its convergence-loop block; _break_equation_duplication stays.
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