docs: add comprehensive comments to RFQ example files

[Copilot]

Added detailed explanatory comments to the 3 RFQ example files to clarify code intention and educational context.

Changes by file

• 00_create_rfq.py: Documented RFQ taker flow - quote reception, tracking, and execution with direction handling
• 01_simple_rfq_quoter.py: Explained market maker quoter mechanics - RFQ filtering, mark price-based pricing strategy, quote lifecycle management
• 02_delta_hedged_quoter.py: Detailed advanced delta-hedging implementation - portfolio delta calculation across asset types, automated hedging triggers, risk limit enforcement, background task coordination

Key additions

Enhanced all class/method docstrings with:

• Conceptual explanations (delta hedging, options Greeks, bid-ask pricing)
• Implementation flow and decision points
• Production readiness warnings where applicable

Example from delta hedger:

async def calculate_delta_from_quote(
    self, quote: QuoteResultSchema | RFQResultPublicSchema
) -> tuple[Decimal, bool]:
    """
    Calculate the net delta exposure from accepting a quote or RFQ.
    
    Delta calculation logic:
    - Each option has a delta value (from 0 to 1 for calls, 0 to -1 for puts)
    - As the SELLER of the quote, we take the opposite side of the taker
    - If taker is buying (we sell), we subtract delta
    - If taker is selling (we buy), we add delta
    
    Returns:
        tuple: (total_delta, is_error)
    """

Total: 384 lines of comments added across 3 files.

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