Downgrade missing required CSV column from error to warning

[claudear]

Summary

• When importing a CSV that doesn't include all required columns from the database schema, the validateCSVHeaders method was throwing an exception that aborted the entire import
• Changed the behavior to emit a warning instead, allowing the import to proceed with null values for missing columns
• The database layer will handle actual constraint violations per-row, giving users partial import instead of total failure
• This fixes the Sentry error CLOUD-3K9V: "CSV header validation failed: Missing required column: 'texte'" (11 occurrences)

Test plan

• Added testValidateCSVHeadersMissingRequiredColumnDoesNotThrow — verifies missing required columns no longer throw
• Added testValidateCSVHeadersAllRequiredPresent — verifies no issues when all required columns exist
• All existing CSV tests continue to pass

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 40061ba8-92e2-439d-8cb0-e591f82a9a97

📥 Commits

Reviewing files that changed from the base of the PR and between bbdd8ef and 0707a0f.

📒 Files selected for processing (2)

• src/Migration/Sources/CSV.php
• tests/Migration/Unit/General/CSVTest.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/csv-missing-required-column-warning-v2

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[claudear]

Fix Confidence: 95/100

The fix is minimal and targeted: changing a throw to a warning in validateCSVHeaders. The root cause is clear from the error message and code. All CI checks pass. The only slight uncertainty is whether downstream consumers expect the exception for control flow, but the CSV.exportGroupDatabases already catches Throwable and converts to an error, so the warning path is strictly better for users.