pop_fileio using MNE import

[arnodelorme]

It should probably be renamed pop_importmne

[claude]

🤖 Research

pop_fileio in EEGPrep dispatches to mne.io.read_raw_* (BrainVision/EDF/BDF/GDF/MFF/CNT), pop_loadset, and pop_importdata — no dependency on FieldTrip's FILE-IO library. The name inherits EEGLAB's plugin naming but no longer reflects the underlying reader. Renaming to pop_importmne is accurate; the change surface is larger than one function.

Relevant code

• `src/eegprep/functions/popfunc/pop_fileio.py` — main function, MNE dispatch
• `src/eegprep/functions/popfunc/pop_biosig.py#L9-L24` — delegates to `pop_fileio`
• `src/eegprep/functions/popfunc/pop_fileio_brainvision_mat.py` — wrapper module also named `pop_fileio_*`
• `src/eegprep/functions/guifunc/eeglab_menu.py#L49` — menu label "Using the FILE-IO interface"
• `src/eegprep/plugins/EEG_BIDS/menu.py#L12-L21` — 5 file-type menu entries using `pop_fileio_*` action strings

Total footprint if we rename the whole family (pop_fileio + 5 action strings + 1 wrapper module): ~140 lines across ~20 files, plus 8 file renames (1 .py + 1 wrapper .py + 6 help .md).

Open questions before I implement

1. Scope. Rename only `pop_fileio` (the function/action) and keep `pop_fileio_brainvision`, `pop_fileio_cnt`, `pop_fileio_eeg`, `pop_fileio_mff`, `pop_fileio_brainvision_mat` action names? Or rename the whole family to `pop_importmne*`? Recommend the whole family — they all route through the same MNE reader.
2. Menu label. "Using the FILE-IO interface" → "Using the MNE interface" (mirrors "Using the BIOSIG interface" below it). OK?
3. `pop_biosig` delegation. It calls `pop_fileio` under the hood but that's an internal detail; keep the `pop_biosig` name. Confirm?
4. Backward compat. Per AGENTS.md "No backward compatibility by default" — drop the `pop_fileio` name entirely (no alias). Confirm you want a clean cut for the public API entry in `src/eegprep/init.py` and the history string (`EEG = pop_importmne(...);`)?

Proposed plan (pending answers above)

• Rename `src/eegprep/functions/popfunc/pop_fileio.py` → `pop_importmne.py`; rename function; update history string to `EEG = pop_importmne(...);`.
• Rename `pop_fileio_brainvision_mat.py` → `pop_importmne_brainvision_mat.py` and its function.
• Update action-string tables in `menu_actions.py` (registered actions + `_SIMPLE_POP_ACTIONS` + `_open_import_filename` filters + import site), `eeglab_menu.py` (menu label + action), `plugins/EEG_BIDS/menu.py` (5 action strings).
• Update `src/eegprep/init.py` public-API map and `cli/commands/migrate.py` phase entry.
• Rename 6 help files `resources/help/pop_fileio*.md` → `pop_importmne*.md` and edit their bodies + cross-refs in `pop_biosig.md`, `troubleshooting_data_formats.md`.
• Update `docs/source/api/pop_functions.rst` and `docs/source/api/io.rst`.
• Update tests: `tests/test_file_menu_pop_functions.py`, `tests/test_sample_data_pop_functions.py`, `tests/test_phase1b_file_edit_pop_functions.py`, `tests/test_gui_main_window.py`, `tests/test_console_workspace.py`.

Waiting on your answers to Q1–Q4 before opening a PR.