Extend Sapat Providers in Daytona

[jjoanna2-debug]

Summary

• Add a distinct Daytona guide for extending Sapat with a new transcription provider inside a reproducible workspace.
• Ground the guide in current Sapat source behavior, provider-adapter design, mocked validation, security/privacy guardrails, and maintainer-ready review criteria.
• Add a provider selection matrix, provider acceptance matrix, provider security checklist, maintainer review checklist, transcription provider adapter definition, original workflow PNG, and first-time author profile.

Validation

• npx --yes markdownlint-cli guides/20260511_extend_sapat_providers_in_daytona.md definitions/20260511_definition_transcription_provider_adapter.md authors/jean_claude_joanna.md --ignore node_modules
• git diff --check

/claim #13