HFI Calculator: Update COFC defaults for should season

**Describe the task**
Update HFI Calculator defaults for COFC so that weather stations and fuel types align with shoulder season settings for each zone.

**Acceptance Criteria**
- [ ] first
- [ ] second
- [ ] third

**Additional context**
- Add any other context about the task here.
- Or here
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Start by locating the HFI Calculator implementation and its configuration for COFC defaults; the issue does not identify files or tests. Done means weather stations and fuel types match the shoulder-season settings for every zone, with the three acceptance criteria clarified and verified.

Written by the indexing model from the issue text.