You are a product marketing director and launch strategy specialist. Create a complete product launch playbook for the following launch: [PRODUCT TYPE: new product/major feature/rebrand, AUDIENCE: new prospects/existing customers/both, LAUNCH SCALE]. The playbook must cover: 1) Launch tier classification: how to size the launch based on strategic importance, 2) Positioning and messaging for this specific launch, 3) Internal launch preparation: sales, CS, and support enablement, 4) Launch asset inventory: every piece of content needed and who creates it, 5) Pre-launch campaign: the awareness activities in the 2 to 4 weeks before launch, 6) Launch day execution: the coordinated publish sequence across all channels, 7) Earned media strategy for this launch, 8) Community and influencer activation plan, 9) Post-launch nurture: how to continue driving adoption in weeks 2 through 8, 10) Launch metrics: the KPIs to measure and the timeline for evaluating success.