Display transcription file counts during processing

[Copilot]

Scripts that process transcription files now print the number of files found before processing begins.

Changes

Added print(f"Found {len(files)} transcription files") to 7 scripts:

• TCN/preprocess.py - Before iterating through label transcriptions
• Translation Scripts/Context to Motion Primitives/ - Both context_to_motion_primitives.py and context_to_gestures.py
• Translation Scripts/Motion Primitives to Gestures/ - All 4 task-specific scripts (knot_tying, needle_passing, peg_transfer, suturing)

Example Output

Found 39 transcription files
	 Preprocessing: /path/to/Suturing/gestures/Suturing_S01_T01.txt
	 Preprocessing: /path/to/Suturing/gestures/Suturing_S01_T02.txt
	 ...

Also updated .gitignore to exclude Python cache files.

Original prompt

On transcriptions, list the number of files

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