feat: publish bounded IBKR execution receipts

[Pigbibi]

Summary

• derive a bounded receipt from IBKR’s existing reconciliation arrays
• preserve the distinction between submitted, explicit fill, pending reconciliation, expected risk block, and unknown runtime failure
• advance the shared evidence publisher and QPK pin

Safety

• a local submission is never reported as a broker acknowledgement or fill
• a fill is emitted only from IBKR’s explicit filled-order reconciliation array
• no order execution, sizing, gateway configuration, or recovery authority changed

Verification

• PYTHONPATH=/home/ubuntu/Projects/.worktrees/qpk-execution-receipt/src:. python3 -m unittest tests.test_execution_receipt_adapter -v
• python3 scripts/check_qpk_pin_consistency.py --pin-file /home/ubuntu/Projects/.worktrees/qpk-execution-receipt/QPK_PIN --paths pyproject.toml uv.lock qsl.toml