DBA 150 Implement cli progress feedback

[Mateus-Cordeiro]

This PR introduces a progress UI for the build command.

The progress display focuses on:

• overall progress across datasources
• the datasource currently being processed
• final per-datasource completion status

How it works

• build and index emit structured progress events while running
• the events describe operations/datasource progress
• the cli consumes those events to render terminal progress feedback

CLI progress rendering

Adds a cli_progress() renderer for interactive terminal. When the terminal is non-interactive, the progress callback becomes a no-op.

Step based datasource progress

The datasource progress model is intentionally high-level, based only on meaningful, potentially long running steps. Each datasource has the following steps:

• plugin execution
• description generation (optional)
• embedding
• persistence

Logging conflicts

While the progress UI is active, console logging from both databao_context_engine and databao_cli is routed through a shared handler, so the log output does not corrupt the live display. This is scoped to the rich progress context and restores the previous logger configuration afterwards.

Notes

The overall progress bar looks better if the logs from either databao_context_engine and databao_cli are not printed during execution. These logs can be stored, and printed after the execution only, possibly creating a better user experience. However, I would like for that to be discussed before applying such a change.

Screen.Recording.2026-03-11.at.11.51.46.mov

[Mateus-Cordeiro]

Waiting on release from DCE