Companion assist tool $47

Path: ASSIST_TOOL/ → rename to <assist-tool>/

Removes manual work from the core offer. Immediate post-purchase OTO.

• role oto1 · $47 · product_id: TODO_OTO1
• test checkout: TODO_TEST_PATH_OTO1
• accept → continue to UPSELL 2
• decline → continue to UPSELL 2 (or core thank-you, per flow)