Context
We would like to A/B test to headline section of the sourcegraph.com/cody page to test some new copy and a new format.

We have a feature flag set up in PostHog to automatically group users into "A" and "B" groups.

• Feature flag: cody-value-headline-test
• Control key: control
• Test key: test-value

Product requirements:
This Figma file shows both the current headline section and the new section we'd like to try:
https://www.figma.com/file/oQgh5R0iSBG3UII6C8CPJ8/Cody-page?type=design&node-id=4582-14344&mode=dev

(For the purpose of this task, please ignore that the Figma mockups use a light/white theme instead of the current dark theme. We'll put the light theme request in a separate request)

• These changes should not impact any other page, including sourcegraph.com/demo/cody.

• Please make sure the feature flag from PostHog is loaded before the full pageload, so that the headline does not appear as the control group and then change after loading in the user's view.

• For "control" group members, they should see the current headline section that's on the page. It has this copy:

"Cody is a coding AI assistant that uses AI and a deep understanding of your codebase to help you write and understand code faster."

• For "test" group members, they should see the new copy that appears in list format:

"Cody is the AI coding assistant that understands your code.

• Ingest Code from any code host
• Choose from the latest AI models
• Get relevant AI suggestions through enhanced context"

• For "undefined" group members (in the case PostHog fails), they should see the same headline as "control" group members.

Telemetry requirements:

• When a user lands on the Cody page, please log an enrollment event to eventLogger. The event name can be ValueHeadlineTestEnrolled
• In the event metadata, please also log the user's variant. control or test
• If you have any questions about telemetry, please let us know and we can clarify!