Chart markup

This drives the browser the user is already signed into, over the Chrome DevTools Protocol, on Stockbit's own chart page. It is the one place this server touches a UI, and everything it draws lands in the user's real saved layout.

The sequence

1. chartbit_open symbol=… — put the chart in front of them. resolution and chart_type set the timeframe and style. Do this first; everything below acts on the open chart.
2. chartbit_analyze symbol=… — derive support, resistance and trend lines from the bars. min_touches controls how much evidence a level needs; lookback how far back to look. With draw=true it draws what it found in one step, and replace=true clears the previous set instead of stacking on it.
3. chartbit_draw symbol=… annotations=… anchor_date=… for anything specific. Times are epoch seconds, and anchor_date is what the annotation coordinates are relative to. Getting this wrong puts a line in 1970, which is visible but not useful.
4. chartbit_study symbol=… study=… for indicators. The studies are a closed list — the tool description names them. A study Stockbit does not have cannot be added by asking twice.
5. chartbit_screenshot symbol=… to see the result, and chartbit_save symbol=… to keep it.

Rules

• Saving is explicit. Stockbit autosaves on its own schedule, which is not yours: if the user wants the markup to survive, call chartbit_save. Say that you did.
• replace versus stacking. Running chartbit_analyze three times without replace=true leaves three sets of lines on the user's real chart. Prefer replace=true unless they asked to add to what is there.
• This is their chart. Do not clear a layout you did not draw without asking. There is no undo.
• Check the drawing landed. Take the screenshot. The CDP call can succeed while the chart rejects the annotation.
• A blank white page means signed out. Stockbit's chart renders nothing at all when there is no session — no login prompt, nothing. If the screenshot is blank, that is what happened, and the fix is a login in that browser, not a retry.