Put a stock or an option contract on one of the USER's portfolio watchlists, without recording any position. A watched instrument shows up in GetMyPortfolio's 'Watching (not held)' section with a current mark and nothing else - no quantity, no cost, no value.
For a stock, pass its ticker. For an option, pass BOTH the underlying ticker and the OCC symbol in optionContract, exactly as AddPortfolioLot takes them; the contract is verified against the live options data before anything is stored.
Watching something the portfolio already holds is allowed - the page shows one row, and selling out later keeps the instrument on the list.
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