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9 daystest(spectool): Add end-to-end test for analysis toolskal
Adds a new CTest unit test that performs a full, end-to-end verification of the 'spectool analyze' command. The test programmatically generates a sine wave, saves it as a .wav file, executes the spectool executable as a subprocess to analyze the wave, and then verifies the integrity of the resulting .spec file. This ensures the analysis pipeline (WAV decoding, windowing, FDCT, and file I/O) works correctly.
9 daysfeat(spectool): Add MP3 support for audio analysisskal
Leverages the built-in MP3 decoder in miniaudio to allow spectool's 'analyze' command to process .mp3 files in addition to .wav files. Updates the tool's command-line help text and the project's HOWTO.md to reflect the new capability.