Fix NaN in Results Overview when eval metric score is not a number

[Copilot]

When eval metrics return non-numeric scores (like "❓" for unknown results), the Results Overview table incorrectly shows "NaN" instead of the appropriate fallback value.

Problem

The issue occurs in the computeOverview function when:

1. An eval metric returns a non-numeric response (e.g., "❓", "Unknown", etc.)
2. The parseScore function returns undefined for these cases
3. The scorer detection logic ms.some((m) => !isNaN(m.score)) incorrectly identifies these as numeric scorers
4. The average calculation ms.reduce((total, m) => total + m.score, 0) / ms.length includes undefined values, resulting in NaN

Example

Before fix:

model | tests | tests positive | accuracy with eval
-- | -- | -- | --
qwen2.5:3b | 20 | 20 | 100
llama3.2:1b | 20 | 20 | NaN  ← Problem: should show count of OK results

After fix:

model | tests | tests positive | accuracy with eval
-- | -- | -- | --
qwen2.5:3b | 20 | 20 | 100
llama3.2:1b | 20 | 20 | 15   ← Fixed: shows count of OK results

Solution

Updated the scorer detection and calculation logic to:

• Only consider metrics with valid numeric scores: typeof m.score === "number" && !isNaN(m.score)
• Calculate averages using only the filtered numeric scores
• Fall back to counting "ok" outcomes when no numeric scores are available

Testing

Verified the fix handles all scenarios correctly:

• ✅ All numeric scores: No regression, averages calculated correctly
• ✅ Mixed numeric/non-numeric: NaN issue resolved, averages only numeric scores
• ✅ All non-numeric scores: Shows count of successful outcomes
• ✅ Empty metrics: Handles gracefully

Fixes #174.

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[pelikhan]

merge with latest 'dev' branch

[Copilot]

merge with latest 'dev' branch

Done! Successfully merged the latest dev branch (92 commits) while preserving the NaN fix. Resolved merge conflict in reports.mts by applying the original fix to the new multi-eval-model structure. The fix now works with both single and multiple eval models. Commit: 10bd4a6

The base branch was changed.