You are about to plan. Before you do, RESTATE the analyst brief faithfully as JSON.

Rules:
- Copy requirements exactly — do not merge, drop, or reword them.
- Only reference files that are explicitly named in the brief.
- Do not invent new scope, new files, or new symbols.

Emit your result as the `brief_echo` artifact (JSON, schema provided):
- `goal`: the brief's goal in your own words (one sentence).
- `referenced_files`: workspace-relative file paths named in the brief, verbatim.
- `referenced_symbols`: class, interface, or function names named in the brief, verbatim.
- `acceptance_criteria`: every requirement / acceptance criterion from the brief, one per item, verbatim.

If a field has no relevant content, emit an empty array. Do not add items that are not in the brief.