feat: Implement spectool & specview; refactor coding style; update docs

This commit introduces new tools for spectrogram manipulation and visualization, establishes a consistent coding style, and updates project documentation.

Key changes include:

- **Spectrogram Tools:

  - : A command-line utility for analyzing WAV/MP3 files into custom  spectrogram format and playing back these spectrograms via the synth engine.

  - : A command-line tool for visualizing  spectrogram files as ASCII art in the console.

- **Coding Style Enforcement:

  - Added a  configuration file enforcing LLVM-based style with 2-space indentation, no tabs, and an 80-column line limit.

  - Renamed all C++ source files from  to  for project consistency.

  - Applied automatic formatting using
exit across the entire codebase.

- **Documentation & Workflow:

  - Created  to define a commit policy requiring tests to pass before committing.

  - Updated  with instructions for building and using  and , and referenced .

  - Updated  and  to reflect the new tools, audio architecture decisions (real-time additive synthesis, double-buffering for dynamic updates, WAV/MP3 support), coding style, and development workflow.

- **Build System:

  - Modified  to:

    - Include new targets for  and  under the  option.

    - Update source file extensions to .

    - Add a new end-to-end test for  to the  suite.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/audio/window.cc b/src/audio/window.cc
new file mode 100644
index 0000000..d92f371
--- /dev/null
+++ b/src/audio/window.cc
@@ -0,0 +1,9 @@
+#include "window.h"
+#include "util/math.h"
+#include <math.h>
+
+void hamming_window_512(float window[WINDOW_SIZE]) {
+  for (int i = 0; i < WINDOW_SIZE; ++i) {
+    window[i] = 0.54f - 0.46f * cosf(2.0f * PI * i / (WINDOW_SIZE - 1));
+  }
+}