chore(ci): add CI workflow and pre-commit; fix header/debug

[quirinpa]

Summary

• Define in .
• Silence debug print (guarded by ).
• Add GitHub Actions workflow (build + test).
• Add lightweight pre-commit hook .

Testing

• Local build: make: Nothing to be done for 'all'.
• Local tests: cc -o tests/test_mod.so tests/test_mod.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/mods/mod_basic.so tests/mods/mod_basic.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/mods/mod_multi.so tests/mods/mod_multi.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/mods/mod_void.so tests/mods/mod_void.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/mods/mod_bare.so tests/mods/mod_bare.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/mods/mod_dep.so tests/mods/mod_dep.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/mods/mod_dep_b.so tests/mods/mod_dep_b.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/mods/mod_dep_c.so tests/mods/mod_dep_c.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -fPIC -shared -L/home/quirinpa/ndx/lib -L/usr/lib -lndx-mod
  cc -o tests/test_core tests/test_core.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -L/home/quirinpa/ndx/lib -L/usr/lib -lndx -lqsys -lqmap -pthread
  cc -o tests/test_errors tests/test_errors.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -L/home/quirinpa/ndx/lib -L/usr/lib -lndx -lqsys -lqmap -pthread
  cc -o tests/test_threads tests/test_threads.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -L/home/quirinpa/ndx/lib -L/usr/lib -lndx -lqsys -lqmap -pthread
  cc -o tests/test_macros tests/test_macros.c -I/home/quirinpa/ndx/include -I/usr/include -Wall -Wextra -Wpedantic -Iinclude -pthread
  -L/home/quirinpa/ndx/lib -L/usr/lib -lndx -lqsys -lqmap -pthread
  Running test_core...
  test_core:
  test_adapter_reg_sets_id: PASS
  test_call_no_mods: PASS
  test_strerror: PASS
  test_errno_after_call: PASS
  test_adapter_sizes: PASS
  all tests passed
  Running test_errors...
  test_errors:
  test_load_missing: PASS
  test_call_invalid_id: PASS
  test_last_no_call: PASS
  test_errno_persists: PASS
  all tests passed
  Running test_threads...
  test_threads:
  test_concurrent_load: PASS
  test_concurrent_call: PASS
  test_concurrent_areg: PASS
  test_concurrent_get: PASS
  all tests passed
  Running test_macros...
  test_macros:
  test_multi_args: PASS
  test_struct_return: PASS
  test_arg_counts: PASS
  test_adapter_name: PASS
  all tests passed
  Running test_deps...
  test_deps:
  debug: dep_hook_id(symbol) = 0, ndx_get('dep_hook') = 0
  test_dep_loads_basic: PASS
  test_missing_dep: PASS
  test_cycle_detect: PASS
  all tests passed
  Running test_main...
  ok
  All tests passed!
• All tests passed locally before creating this PR.

Notes

• gate available to re-enable diagnostics.
• Pre-commit currently runs a fast make: Nothing to be done for 'all'. dry-run; we can tighten it later.