Add DMF test module covering dm_sw_ring public API

[Copilot]

Issue required a dedicated tests/ DMF module that executes dm_sw_ring through its exported API surface. This PR adds that module and integrates it into the repository build so test DMF is produced alongside the main module.

• Build wiring

  • Added add_subdirectory(tests) in root CMakeLists.txt.
  • Added tests/CMakeLists.txt defining test_dm_sw_ring as a DMOD executable and linking against dm_sw_ring_if.

• New API-level test module

  • Added tests/test_dm_sw_ring.c.
  • The test module exercises all public APIs:
    • lifecycle: create, destroy
    • data path: write, read, peek, discard, clear
    • state/introspection: capacity, size, available_space, is_full, is_empty
  • Refactored execution into separate test steps per API function, with shared setup/teardown for deterministic isolation.
  • Uses deterministic flags (non-blocking behavior) and explicit assertions with actual/expected diagnostics, including NULL-buffer error-path checks.

• Manifest and release metadata

  • Updated manifest.dmm to include test_dm_sw_ring module entry.
  • Updated release workflow generation of versions.dmm to include $version-available test_dm_sw_ring ....

• Resulting artifact behavior

  • Build now generates test_dm_sw_ring.dmf from the new tests/ module, matching expected module layout for API test execution.

dm_sw_ring_t ring = dm_sw_ring_create(4, dm_sw_ring_flags_drop_old_data | dm_sw_ring_flags_mutex_sync);

EXPECT_EQ_U32(dm_sw_ring_write(ring, test_data_overflow, 5), 5);
EXPECT_EQ_I32(dm_sw_ring_peek(ring, io_buffer, 4), 4);
EXPECT_EQ_U8(io_buffer[0], 12); // oldest byte dropped as expected

dm_sw_ring_destroy(ring);

[JohnAmadis]

@copilot zrób osobne stepy dla każdej testowanej funkcji, przygotuj setup i teardown, postaraj się osiągnąć z 80% code coverage, zaktualizuj manifest o ten moduł testowy,

[Copilot]

@copilot zrób osobne stepy dla każdej testowanej funkcji, przygotuj setup i teardown, postaraj się osiągnąć z 80% code coverage, zaktualizuj manifest o ten moduł testowy,

Gotowe w commitcie 3ae8980.

Wprowadziłem osobne kroki testowe dla każdej funkcji publicznego API (create, destroy, write, read, capacity, size, available_space, peek, discard, clear, is_full, is_empty) oraz wspólne setup/teardown uruchamiane dla kroków wymagających pierścienia. Dodatkowo zaktualizowałem manifest.dmm o wpis test_dm_sw_ring i dodałem generowanie $version-available test_dm_sw_ring w workflow release, żeby manifest był spójny z modułem testowym.