Rev002 minimal AI nutrition pipeline

Files:
- scripts/agent_prompt.txt  (agent prompt)
- scripts/process_text.py   (CLI runner, calls agent or fallback parser)
- data/food_log.csv         (rows appended on success)

Usage examples:
 python3 scripts/process_text.py "בננה"
 python3 scripts/process_text.py "בננה 100 גרם"
 python3 scripts/process_text.py "בננה ו-2 ביצים"

Notes:
- Agent: uses OpenAI gpt-5-mini if OPENAI_API_KEY env var is set, otherwise deterministic fallback parser.
- Output: JSON only. CSV columns: timestamp,event_id,raw_text,food_name,quantity,unit,calories,protein_g,fat_g,confidence,status,parser_source
- Keeps CLI-only minimal scope per ULTRA LOW TOKEN MODE instructions.