feat(importers): add CSV support for generate --from-log

[hidai25]

Summary

Add CSV import support so teams can generate test suites from spreadsheet-style logs.

Why

Many teams export agent interactions as CSV — this is the lowest-friction import format with broad utility.

Scope

• Parse query,output,tools CSV format into LogEntry objects
• Support --log-format csv flag in evalview generate --from-log
• Handle malformed rows gracefully (skip with warning)
• Add docs/examples for CSV format

Acceptance Criteria

• evalview generate --from-log traces.csv --log-format csv works
• Malformed rows are skipped with clear warning messages
• Fixture-based tests cover happy path and edge cases
• Example CSV file in examples/ or docs

Getting Started

Look at evalview/importers/log_importer.py for the existing importer pattern.

[JiwaniZakir]

Looking into this, will submit a fix if I can confirm the issue.

[hidai25]

Hi! ok sounds good. should I assign you to the issue?

[hidai25]

Hey @JiwaniZakir — just checking in, are you still looking into this? No rush, just want to keep the backlog tidy. Let me know!