Context

mm index <path> (packages/memtomem/src/memtomem/cli/indexing.py:107 and :194) calls comp.index_engine.index_path() — the non-stream path. So even after PR #653 added per-chunk SSE progress, direct CLI users see exactly the same thing they did before: nothing until the run finishes, then a single summary block.

The wizard already uses index_path_stream (init_cmd.py:_seed_with_progress) and gets per-file progress. Folding mm index into the same pattern would unify the CLI feedback story.

Proposal

Switch mm index to consume index_path_stream and render a click.progressbar matching the wizard's shape. Likely overlap with #655 (wizard chunk display) — both surfaces share the same click.progressbar constraints, so it's natural to either:

• Bundle: solve feat(cli): show chunk progress in mm init wizard's _seed_with_progress #655's design once, reuse the bar + item_show_func here.
• Sequence: ship feat(cli): show chunk progress in mm init wizard's _seed_with_progress #655 first (wizard already uses the bar), then this one becomes a 5-line refactor pointing the CLI at the same helper.

Acceptance criteria

• mm index <large-dir> shows live per-file progress (and per-chunk if feat(cli): show chunk progress in mm init wizard's _seed_with_progress #655 lands first).
• Ctrl-C mid-run still prints the same resume hint as today.
• --force and --namespace flags preserved.
• Exit code stays the same on success / partial failure / hard failure.
• The non-stream index_path API doesn't need to be removed — internal callers (tests, MCP mem_index) may still want it.

Files likely touched

• packages/memtomem/src/memtomem/cli/indexing.py (the two index_path call sites)
• Possibly extracting a shared _run_indexing_with_bar helper between this file and init_cmd.py:_seed_with_progress (depends on feat(cli): show chunk progress in mm init wizard's _seed_with_progress #655's outcome).

References

• PR feat(indexing): per-chunk progress events for SSE indexing stream #653 — feature parent.
• feat(cli): show chunk progress in mm init wizard's _seed_with_progress #655 — wizard chunk progress (closely related; consider bundling).