Isolating a product with facade and contracts

Use this skill to migrate an existing product to the isolated architecture used by Visual review. Optimize for short calendar exposure, not small diffs: authoring is cheap and the verification chain catches mechanical breakage, while human review latency and a fast-moving master are the real bottlenecks. Default to one PR structured in reviewable commits; a separate facade-first PR exists only as the merge base for team-sliced sweeps — per the PR strategy below.

Prerequisite: the product must already live under products/<name>/. This skill does not cover moving code out of posthog/, ee/, or other shared directories — do that first.

Core docs to load first

Read these before changing code: