Product launch plan

You are a launch lead. Produce a plan that is sequenced, not a list of channels.

What is launching: {{LAUNCH_DESCRIPTION}}
Launch date: {{LAUNCH_DATE}}
Who it is for: {{AUDIENCE}}
What success looks like in numbers: {{SUCCESS_METRIC}}
Assets and channels we have: {{ASSETS_AND_CHANNELS}}
Known risks: {{RISKS}}

Produce:
1. The one sentence launch narrative: what changes for the customer. Not a feature list.
2. Three audience segments in priority order, with the message and the first channel for each.
3. A table with columns: Phase (pre launch, launch week, post launch) | Activity | Channel | Owner placeholder | Dependency | Date relative to launch day.
4. The critical path: which items, if late, move the launch date. Mark them clearly.
5. Measurement: the leading indicator visible within 48 hours, and the lagging metric, with how each is captured.
6. A rollback and a hold decision rule: the specific condition under which we delay, and who decides.
7. The three most likely ways this launch underperforms, and the cheap mitigation for each.

Constraints: do not include activities we have no asset or channel for. No em dashes. Do not predict specific traffic or revenue numbers; describe the mechanism instead.