Configure user defined point sources for elastodynamics

[rwalkerlewis]

Adds configurable moment tensor point sources for elastodynamics to simulate earthquake sources.

This PR introduces a new PointMomentTensor component, enabling users to define point sources with custom locations, magnitudes, moment tensors, and various source time functions (Ricker, Gaussian, Step, Ramp) through configuration files. The implementation includes C++ kernels for force computation, Python bindings, and comprehensive C++ MMS tests and full-scale examples to ensure accuracy and demonstrate usage.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[rwalkerlewis]

@cursor CI build failed https://github.com/rwalkerlewis/pylith/actions/runs/19701392495/job/56438305958#step:3:1

[cursor]

I've fixed the CI build failure. The issue was that the configure.ac file was missing entries for the new source directories, causing the autotools build system to fail when it tried to install the sources module.

Changes Made:

1. configure.ac - Added the following missing Makefile entries:

   • libsrc/pylith/sources/Makefile
   • modulesrc/sources/Makefile
   • tests/mmstests/linearelasticity/pointsource-2d/Makefile
   • tests/fullscale/linearelasticity/pointsource-2d/Makefile

2. modulesrc/sources/Makefile.am - Updated with proper SWIG build rules including:

   • subpkgpython_LTLIBRARIES and subpkgpython_PYTHON declarations
   • Proper _sources_la_* build rules
   • SWIG conditional generation rules

3. tests/mmstests/linearelasticity/pointsource-2d/Makefile.am - Fixed with:

   • Proper source files including MMSTest.cc and driver_catch2.cc
   • dist_noinst_HEADERS declarations
   • Standard MMS test build rules

4. tests/fullscale/linearelasticity/pointsource-2d/Makefile.am - Fixed with:

   • Standard fullscale test includes and clean rules

The fix has been pushed. The CI should now be able to build the sources module correctly.

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[rwalkerlewis]

@cursor CI build still fails

[cursor]

I've fixed the compilation errors. There were two issues:

1. libsrc/pylith/fekernels/fekernelsfwd.hh - Added missing forward declarations for PointForce2D and PointForce3D classes. Without these, the compiler couldn't resolve the class names used in PointForce.hh.

2. libsrc/pylith/sources/PointForceAuxiliaryFactory.cc - Changed the include from ElasticityScales.hh to Scales.hh. The code was calling methods like _scales->getLengthScale() on the Scales pointer inherited from AuxiliaryFactory, but only had a forward declaration available. Including Scales.hh provides the full class definition needed to call these methods.

The fix has been pushed. The CI should now compile successfully.

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