prune: --calibration flag silently ignored during actual pruning

[noahgift]

Bug

apr prune model.gguf --calibration data.jsonl -o out.gguf accepts --calibration and displays it in the config table, but never passes it to execute_pruning() at line 173-180 of prune.rs.

Affected Code

• Line 134: calibration: Option<&Path> accepted
• Lines 156-164: calibration passed to print_config_table() (display only)
• Lines 173-180: execute_pruning() called WITHOUT calibration parameter

Expected

Either:

• Pass calibration data to the pruning algorithm for calibration-aware pruning
• Or reject --calibration with an error: "Calibration-aware pruning not yet implemented"

Actual

Flag is silently accepted, shown in the config output, but the calibration data is never used.