Ranked remediation summary for top re-identification drivers

[ishwar170695]

Currently remediation guidance is embedded per-finding, which makes it easy to miss the highest-priority actions when there are many findings.
Suggestion: add a "Priority Actions" section at the top of the report that:

• Ranks findings by confidence (high -> medium -> low)
• Groups by category where signals cluster
• Surfaces top 3–5 as numbered action items in plain language e.g. "1. Location signals := 4 high-confidence findings. Avoid referencing city/neighborhood in posts."

The data is already in Finding.confidence, Finding.category, and Finding.remediation. This would be a presentation-layer addition to report.ts.