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ci: run unit-test memcheck in parallel (#260)

ctest ran the 166 tests serially under valgrind (~1.8 s each, ~300 s
total), which was most of the CI critical path. Pass CTEST_PARALLEL_LEVEL
into the container for run_unit_tests and run_low_mem_unit_tests so ctest
uses every runner core. CI-only: scripts/run_unit_tests.sh and local runs
are unchanged.

Document the parallel execution, and the constraint it places on tests,
in ARCHITECTURE.md's Testing Strategy.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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