Add proposed timeline and budget (for team discussion)

[MaxGhenis]

Summary

This PR adds a proposed timeline and budget section to the roadmap. These estimates are presented as one proposal for discussion, not a final plan.

Proposed:

• Timeline: 18 months across 6 phases
• Personnel: ~1.5 FTE (Max 60%, Ben 50%, John 30%)
• Budget: ~$270,000-370,000

Alternative scenarios included:

• Accelerated (12 months)
• Extended (24 months)
• MVP (9 months)

Context

This content was separated from the main roadmap to allow the methodology and phasing to be reviewed independently from timeline/budget assumptions. The "Open Questions for Planning" section in master frames the key decisions that need discussion before finalizing these estimates.

Questions for discussion

1. Does the 18-month timeline reflect realistic expectations given AI-assisted development?
2. Is the personnel allocation appropriate, or should we consider different team structures?
3. Should we pursue a planning grant first to align on approach before full funding?
4. How does existing PolicyEngine infrastructure (SSI, SNAP, etc. already implemented) change the scope estimate?

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Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com