Add live conversation signposts

[dtrn2048]

Summary

• add incremental live conversation signposting for final transcript chunks
• surface signposts in portal settings, conversation overview, and the host guide live panel
• add backend/frontend/test coverage and the Directus schema for conversation signposts

Checks

• uv run ruff check (echo/server)
• uv run --with ruff ruff check (echo/agent)
• local Cypress signposts E2E previously passed

Testing deploy note

• apply the Directus sync snapshot on testing before validating the feature

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/signposts

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