feat(build): install/export rules, umbrella header, verified consumer

tests/CMakeLists.txt

@@ -73,3 +73,15 @@ target_compile_definitions(plot_tests PRIVATE PLOT_PYRAMID_COUNT_COVERS
 plot_apply_warnings(plot_tests)
 
 add_test(NAME plot_tests COMMAND plot_tests)
+
+# The GL tests create a real EGL context, and llvmpipe's teardown leaks driver
+# allocations that are not this library's. The suppressions file names those
+# libraries and nothing else (see cmake/plot_asan_suppressions.txt); a report from
+# anything under include/plot/ or src/ is still an error. The environment is set
+# on the test rather than in a preset so `ctest --test-dir build/asan` gets it
+# however it is launched, and print_suppressions makes the counts visible -- a run
+# must show what it suppressed, not hide it.
+if(PLOT_ASAN_ENABLED)
+  set_tests_properties(plot_tests PROPERTIES ENVIRONMENT
+    "ASAN_OPTIONS=detect_leaks=1:print_suppressions=1:suppressions=${CMAKE_SOURCE_DIR}/cmake/plot_asan_suppressions.txt")
+endif()