canary: --input flag silently ignored in create_canary

[noahgift]

Bug

create_canary() at line 195 of canary.rs accepts _input_path: &Path (underscore prefix = unused). The --input flag is documented and accepted by the CLI but the reference input is never used.

Affected Code

• Line 195: fn create_canary(model_path: &Path, _input_path: &Path, output_path: &Path)
• Line 103: create_canary(&file, &input, &output) passes input from CLI
• Lines 198-201: Only model_path and output_path are used/displayed

Expected

Either use the input file for canary reference data, or reject the flag with an error if not implemented.

Actual

apr canary create model.gguf --input ref.wav --output canary.json silently ignores ref.wav.