[yadavchiragg]

Fixes #648

Problem: concore_read.m, concore_write.m, concore_initval.m and concore_default_maxtime.m call concore_literal_eval and concore_literal_serialize, but mkconcore.py never copied those two files into the generated src/ folder. A MATLAB/Octave node would fail on its first read or write.

Change: copy both helpers alongside the other concore_.m runtime files. The generated build scripts already copy concore_.m with a wildcard, so no change was needed there. mkconcore.py has mixed line endings, so the edit keeps the existing ones.

Testing: new tests/test_matlab_runtime_files.py generates demo/sampleM.graphml for posix, windows and docker. It checks both helpers are in src/, that every concore_* function called by a copied runtime file is itself copied, and that the build script still uses the concore_*.m wildcard. 6 of the 8 tests fail on current dev and pass with this change. ruff format --check and ruff check are clean.

Not run under real MATLAB or Octave, only checked at the generated-files level.

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