feat: add prompt-free embed summary

[Victor "David" Medina (Victor-David-Medina)]

Summary

• Adds prompt-free embed summary data to CouncilVerse formations payloads.
• Keeps embed consumers away from raw prompt text while preserving useful room, question, verdict, confidence, method, and participant summary fields.

Verification

• npm test -- --run: 6 files, 134 tests passed
• npm run build: passed
• npm run pii:scan: passed
• npm run example:local: passed
• git diff --check HEAD~1..HEAD: passed
• added-line em/en dash scan: passed

Notes

• No external sends, live billing, production deploy, or client-specific code.