[DavertMik]

Problem

A plan for a pet store had 25 tests and none touched the cart. "Add to cart" only exists in the product dialog, which opens when a card is clicked, and deep research never clicked a card:

• Lists are written as Data: sections with no UI map table.
• parseResearchSections drops Data: sections, so _discoverExpandables never sees them as candidates.

The Planner's grounding rules then correctly refused to plan what research had not seen.

Change

• performDeepAnalysis now also clicks the first suitable item control in each Data: section (_findDataItems). This adds at most one click per list, on top of maxExpandableClicks.
• A control qualifies only if it is a real link or has aria-haspopup, aria-expanded or aria-controls. Deep research must not press an unlabelled row button such as Delete on existing data, so this rule is deterministic, using ARIA attributes.
• WebElement.revealsContent holds that ARIA check, replacing the copy in driller.ts.
• No prompt text changed.

Testing

• New real-browser tests in tests/integration/deep-analysis-data-items-browser.test.ts: opens only the first item, follows links, never presses an undeclared button, skips past an unsafe control, tolerates a missing container.
• bun test tests/unit tests/integration: 1924 pass, 8 fail. The same 8 fail on a clean main locally (7 Provider, 1 ApibotConfigParser).
• One real run against the store before merging latest main: research found the product dialog and Add to cart, and 4 of 7 planned tests add to the cart. The tests were generated, not executed.

Known limits

• Checkout is still not planned as a flow. It only works with an item in the cart, and research does not add items.
• Plain clickable items with no link or ARIA attributes are still not opened.

The regression workflow needs a human approval because this touches src/ai/.

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