docs: expose format-first strategy note

[Ymenjour]

Summary

Expose the new Strategy/FormatFirstNotIdeFirst.md document directly from the root README Start here table.

Changes

• Adds one entry in Read this for Format-first, not IDE-first.
• Positions the note as a strategic explanation of why FROG's durable asset is the public source-to-FIR-to-contract pipeline rather than one IDE product.

Validation

Documentation-only change.