chore(testing): add unit tests and update core render/network pipelines

- add new tests:
  - test_blp_loader.cpp
  - test_dbc_loader.cpp
  - test_entity.cpp
  - test_frustum.cpp
  - test_m2_structs.cpp
  - test_opcode_table.cpp
  - test_packet.cpp
  - test_srp.cpp
  - CMakeLists.txt
- add docs and progress tracking:
  - TESTING.md
  - perf_baseline.md
- update project config/build:
  - .gitignore
  - CMakeLists.txt
  - test.sh
- core engine updates:
  - application.cpp
  - game_handler.cpp
  - world_socket.cpp
  - adt_loader.cpp
  - asset_manager.cpp
  - m2_renderer.cpp
  - post_process_pipeline.cpp
  - renderer.cpp
  - terrain_manager.cpp
  - game_screen.cpp
- add profiler header:
  - profiler.hpp

tests/test_blp_loader.cpp

@@ -0,0 +1,92 @@
+// Phase 0 – BLP loader tests: isValid, format names, invalid data handling
+#include <catch_amalgamated.hpp>
+#include "pipeline/blp_loader.hpp"
+
+using wowee::pipeline::BLPLoader;
+using wowee::pipeline::BLPImage;
+using wowee::pipeline::BLPFormat;
+using wowee::pipeline::BLPCompression;
+
+TEST_CASE("BLPImage default is invalid", "[blp]") {
+    BLPImage img;
+    REQUIRE_FALSE(img.isValid());
+    REQUIRE(img.width == 0);
+    REQUIRE(img.height == 0);
+    REQUIRE(img.format == BLPFormat::UNKNOWN);
+    REQUIRE(img.compression == BLPCompression::NONE);
+}
+
+TEST_CASE("BLPImage isValid with data", "[blp]") {
+    BLPImage img;
+    img.width = 64;
+    img.height = 64;
+    img.data.resize(64 * 64 * 4, 0xFF);  // RGBA
+    REQUIRE(img.isValid());
+}
+
+TEST_CASE("BLPImage isValid requires non-empty data", "[blp]") {
+    BLPImage img;
+    img.width = 64;
+    img.height = 64;
+    // data is empty
+    REQUIRE_FALSE(img.isValid());
+}
+
+TEST_CASE("BLPLoader::load empty data returns invalid", "[blp]") {
+    std::vector<uint8_t> empty;
+    auto img = BLPLoader::load(empty);
+    REQUIRE_FALSE(img.isValid());
+}
+
+TEST_CASE("BLPLoader::load too small data returns invalid", "[blp]") {
+    std::vector<uint8_t> tiny = {0x42, 0x4C, 0x50}; // BLP but truncated
+    auto img = BLPLoader::load(tiny);
+    REQUIRE_FALSE(img.isValid());
+}
+
+TEST_CASE("BLPLoader::load invalid magic returns invalid", "[blp]") {
+    // Provide enough bytes but with wrong magic
+    std::vector<uint8_t> bad(256, 0);
+    bad[0] = 'N'; bad[1] = 'O'; bad[2] = 'T'; bad[3] = '!';
+    auto img = BLPLoader::load(bad);
+    REQUIRE_FALSE(img.isValid());
+}
+
+TEST_CASE("BLPLoader getFormatName returns non-null", "[blp]") {
+    REQUIRE(BLPLoader::getFormatName(BLPFormat::UNKNOWN) != nullptr);
+    REQUIRE(BLPLoader::getFormatName(BLPFormat::BLP1) != nullptr);
+    REQUIRE(BLPLoader::getFormatName(BLPFormat::BLP2) != nullptr);
+
+    // Check that names are distinct
+    REQUIRE(std::string(BLPLoader::getFormatName(BLPFormat::BLP1)) !=
+            std::string(BLPLoader::getFormatName(BLPFormat::BLP2)));
+}
+
+TEST_CASE("BLPLoader getCompressionName returns non-null", "[blp]") {
+    REQUIRE(BLPLoader::getCompressionName(BLPCompression::NONE) != nullptr);
+    REQUIRE(BLPLoader::getCompressionName(BLPCompression::DXT1) != nullptr);
+    REQUIRE(BLPLoader::getCompressionName(BLPCompression::DXT3) != nullptr);
+    REQUIRE(BLPLoader::getCompressionName(BLPCompression::DXT5) != nullptr);
+    REQUIRE(BLPLoader::getCompressionName(BLPCompression::PALETTE) != nullptr);
+    REQUIRE(BLPLoader::getCompressionName(BLPCompression::ARGB8888) != nullptr);
+
+    // Check that DXT names differ
+    REQUIRE(std::string(BLPLoader::getCompressionName(BLPCompression::DXT1)) !=
+            std::string(BLPLoader::getCompressionName(BLPCompression::DXT5)));
+}
+
+TEST_CASE("BLPImage mipmap storage", "[blp]") {
+    BLPImage img;
+    img.width = 128;
+    img.height = 128;
+    img.data.resize(128 * 128 * 4, 0);
+    img.mipLevels = 3;
+
+    // Add mipmap data
+    img.mipmaps.push_back(std::vector<uint8_t>(64 * 64 * 4, 0));
+    img.mipmaps.push_back(std::vector<uint8_t>(32 * 32 * 4, 0));
+    img.mipmaps.push_back(std::vector<uint8_t>(16 * 16 * 4, 0));
+
+    REQUIRE(img.isValid());
+    REQUIRE(img.mipmaps.size() == 3);
+}