Demote BilinearIntegrator from template defaults — quantum templates flip to HermitianExponentialIntegrator (#334) - #335
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…grator - SmoothPulseProblem / SplinePulseProblem / BangBangPulseProblem default integrator -> HermitianExponentialIntegrator (analytic DK derivatives, globals-aware, #328-warp-aware). BilinearIntegrator survives as the explicit integrator_type = :pwc choice with its honesty warnings. - SplinePulseProblem: :spline is now the valid default resolution (the 'not available' essay + silent-PWC #275 guard die with the old PWC default); :pwc stays the acknowledged escape hatch. - Docstrings rewritten to the truth (issue #334). Test sweep + suite verdict ride the next commits.
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Executes the #334 demotion arc (plan-20260816-193000, user-reconfirmed 2026-09-02):
HermitianExponentialIntegrator(Piccolo-native since feat(3b): SplineIntegrator shared type + dense cells to Piccolo (open-core slice 3b) #322/feat(321): HermitianExponentialIntegrator warp column — derived-Δt dynamics with exact duration sensitivities (TR Phase 1b) #328 — analytic Daleckii–Krein derivatives, globals-aware, warp-column-compatible).BilinearIntegratorsurvives as the explicitintegrator_type = :pwcchoice with its honesty warnings intact — the generic bilinear tier is DTO's concern, out of scope here.integrator_type = :splineis now a VALID resolution (the old 'not available' essay claimed Piccolo ships no spline integrator — false since feat(3b): SplineIntegrator shared type + dense cells to Piccolo (open-core slice 3b) #322).Out of scope (per #334): DTO-side BilinearIntegrator hardening (#307-class) — tracked separately.
Closes #334. Verification: full local suite in flight; CI on push.