run_capsule.py crashes when SUITE2P_ROI_STATS keys are missing (CaImAn or Suite2p v1.1 extraction)

## Bug

`run_capsule.py` fails on line 958 with a `KeyError` when the extraction file's `rois/` group doesn't contain every key in `SUITE2P_ROI_STATS`:

```python
SUITE2P_ROI_STATS = (
"aspect_ratio",
"compact",
"solidity",
"radius",
"footprint",
)
```

`load_generic_group()` does a plain `f[h5_group][h5_key][:]`, which raises immediately if the key is absent -- and the dict comprehension loading all five (`nwb_ophys`, line ~958) has no error handling around it.

## Root cause

Two extraction configurations no longer produce all five stats:

- **CaImAn-based extraction** (`greedy_roi`/`corr_pnr` init modes, or CNMF/CNMF-E neuropil refinement): `aind-ophys-extraction`'s `extraction.py` sets `keys = []` for these paths -- *none* of the five stats are ever written to `rois/`.
- **Suite2p v1.1** (the recent `aind-ophys-extraction` migration to Suite2p's new `db`/`settings` API): `solidity` is no longer computed by Suite2p's ROI stats at all. The other four (`aspect_ratio`, `compact`, `radius`, `footprint`) are still present.

## Where this shows up

There are two call sites doing this unconditional load, both in `run_capsule.py`:

- `nwb_ophys_single_plane` (~line 558) -- has a broad `try/except` around the whole block (~line 640) that falls back to a bare ROI table on *any* exception, so it doesn't crash, but it silently drops **all** classifier + stats columns even when only one stat (e.g. `solidity`) was actually missing.
- `nwb_ophys` (~line 958) -- has no such wrapper, so it crashes the whole run outright. This is the one reported.

## Suggested fix

Load each stat individually and keep only the ones that actually exist, instead of all-or-nothing:

```python
available_stats = []
suite2p_stats = {}
for stat in SUITE2P_ROI_STATS:
try:
suite2p_stats[stat] = load_generic_group(
file_paths["planes"][plane_name]["extraction_h5"], h5_group="rois", h5_key=stat
)
available_stats.append(stat)
except KeyError:
pass
```

Then build `columns`/`colnames`/`add_roi(**{...})` from `available_stats` instead of the `SUITE2P_ROI_STATS` constant, in both `nwb_ophys` and `nwb_ophys_single_plane`. This means:
- CaImAn-based extraction files get a valid NWB file with zero suite2p-stat columns (instead of crashing).
- Suite2p v1.1 files keep 4 of 5 stat columns (instead of losing all of them via the existing broad fallback, or crashing).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Start in run_capsule.py at the two call sites named in the issue: nwb_ophys_single_plane around line 558 and nwb_ophys around line 958. Read how SUITE2P_ROI_STATS is loaded through load_generic_group and how columns, colnames, and add_roi are built. Done means missing rois/ stats no longer crash the run, CaImAn files can omit all five stats, and Suite2p v1.1 keeps the four stats it still provides.

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