Release 2026.06.30

Upgrade instructions

From #7291 (CCE: switch InitializeJ dispatch to call_with_dynamic_type):

No user-facing or input-file changes. Developer note for anyone adding an InitializeJ generator: the base class no longer has a virtual operator(). A generator now declares its own return_tags/argument_tags, implements a non-virtual operator() matching them, and is added to InitializeJ<...>::creatable_classes. Set static constexpr bool factory_creatable = false; if it should be dispatchable/charm-registered but not option-creatable (as LinearizedBondiSachs does).

From #7315 (Add KerrSchild initial guess to AH finder):

To specify an initial guess for the apparent horizon finder, now specify InitialL and InitialShape in one of three ways:

1. Initial shape is a coordinate sphere. Example:

InitialGuess:
  InitialL: 10
  InitialShape:
    Sphere:
      Radius: 2.5
      Center: [0.0, 0.0, 0.0]

2. Initial shape is read from a file, then prolonged or extended to InitialL:

InitialGuess:
  InitialL: 10
  InitialShape:
    FromFile:
      H5Filename: TestStrahlkorperOptions.h5
      SubfileName: TestSurface_Ylm
      Time: 1.23
      TimeEpsilon: 1.0e-10
      CheckFrame: true

3. Initial shape is that of a Kerr-Schild black hole. Example:

InitialGuess:
  InitialL: 10
  InitialShape:
    KerrSchild:
      Center: [0.1, -0.2, 0.3]
      Mass: 0.5
      Spin: [0.0, 0.0, 0.7]

From #7337 (Split SphericalHarmonics library):

• Strahlkorper files have moved from NumericalAlgorithms/SphericalHarmonics/ to NumericalAlgorithms/Strahlkorper/. Also the Python bindings have moved accordingly.
• TensorYlm files have moved from NumericalAlgorithms/SphericalHarmonics/ to NumericalAlgorithms/TensorYlm/.

Merged pull-requests (52)

General changes (50):

• Fix macOS cache misses in CI (#7293)
• Add TensorYlm transform helpers for shell power monitors (#7227)
• CCE: switch InitializeJ dispatch to call_with_dynamic_type (#7291)
• Make interpolation from multiple non-conforming neighbors deterministic (#7278)
• Add CodingAgents Singularity/Apptainer definition file (#7274)
• Coordinate transformation for SSF (#7249)
• Fix overlay logic when tag-options are not 1-to-1 (#7275)
• Inherit base tags properly with CceEvolutionPrefix (#7284)
• Update CartoonSphere1D creator to use ZernikeB1 and internal BCs (#7268)
• Add --removing-overlapping-segments flag to CombineH5Dat.py (#7255)
• Added coupling functions for ScalarGaussBonnet theory. (#7254)
• Add support for spherical shells in the wavezone to the BCO creator. (#7205)
• Interpolation: add derivative method to SpanInterpolators (#7294)
• Add SpectralFilter action for volume filtering (#7285)
• Add ProjectSpectralFilter AMR projector (#7289)
• Add entry to contributor list after first commit (#7301)
• Give better error for parse errors caused by tabs (#7305)
• Suppress compiler warning seen for Catch2 with clang22 (#7299)
• Optimize GenerateXdmf (#7296)
• Add LtsMode (#7290)
• Add dummy LtsTimeStepper to compile LTS code in GTS mode (#7295)
• Fixed machine configuration files for Urania (#7307)
• Support ZernikeB1 & Cartoon in Hypercube filter (#7302)
• Add shell scripts for claude stop hooks, disable clang-tidy MSVC warnings (#7281)
• Switch executables to new filtering (#7303)
• Add computation of constraint equations in vacuum GR (#7288)
• Remove old exponential filtering mechanism (#7311)
• Deploy CCE executables on arm64 (#7309)
• Reduce CI disk usage by deleting Android SDK, etc. Re-enable code coverage (#7310)
• Add zero_highest_modes spectral filter (#7312)
• Fix Doxygen 1.16 warnings (#7321)
• Add equal-rate regions (#7272)
• Add B3 derivatives (#7264)
• Add filled sphere capability to SphericalShells domain creator (#7266)
• Add boundary correction filtering (#7304)
• Add HollowCylinder filter (#7313)
• Support using an outer spherical shell for CBCO wavezone (#7221)
• CCE: add second-order radial-derivative-of-J helper (#7306)
• Zernikeb1 subcell projection (#7241)
• Some trivial LTS-GTS unification changes (#7326)
• CCE: compute boundary Du<Dr> by time-differentiating Dr (#7308)
• Loosen Interpolation.IrregularInterpolant tolerance (#7325)
• Generalize time-stepper tolerance collection (#7273)
• Generalize B2 filtering to exponentials and cylinders (#7329)
• Add KerrSchild initial guess to AH finder (#7315)
• Have time_dependence::None::functions_of_time return empty map (#7332)
• Claude skill polishes (#7328)
• Add FilledCylinder filtering (#7331)
• Split SphericalHarmonics library (#7337)
• CCE: add CauchySecondOrder initial-data scheme (#7330)

Bugfixes (2):

• fix bug with TargetParams when evolving SpEC ID (#7213)
• Fix for Issue 7298 (#7322)

Contributors (12): @nilsdeppe, @geoffrey4444, @gda98re, @kidder, @NamiNishimura73, @wthrowe, @michaeldmurphy1, @JosePineda684, @FabrizioCorelli, @hen-w, @macedo22, @nilsvu