fix(moss-cli): keep newlines in quoted csv fields on doc import

[RyanRana]

moss doc add -f file.csv fed content.splitlines() to csv.DictReader, so a newline inside a quoted text field was dropped and the words around it got glued together ("line oneline two"). now parses from a stream, validates the header, strips a utf-8 bom, and reports real line numbers. tests added.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Codex review

No issues found.

[HarshaNalluru]

@RyanRana sign the CLA #488 (comment)

[RyanRana]

done!

[Copilot]

Pull request overview

Fixes moss doc add -f file.csv CSV importing so that newlines inside quoted CSV fields are preserved (instead of being lost via splitlines()), while improving CSV validation and error reporting in the moss-cli import path.

Changes:

• Parse CSV from a stream (io.StringIO) instead of splitlines() so quoted multi-line fields remain intact.
• Validate/normalize the CSV header (trim whitespace, require id and text) and improve error messages with real CSV line numbers.
• Add pytest coverage for multi-line fields, header trimming/validation, and line-numbered error reporting.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
packages/moss-cli/src/moss_cli/documents.py	Switch CSV parsing to a stream, validate headers, and report CSV line numbers; refactor JSON parsing for metadata/embedding columns.
packages/moss-cli/tests/test_documents.py	Add tests covering multi-line quoted fields, header trimming, missing columns, short rows, and line-numbered errors.

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[RyanRana]

Pushed a fix and squashed to a single commit.

The blocking codex-review finding was correct — the Apply suggestions from code review commit landed reader = csv.DictReader(...) dedented outside _parse_csv_docs, which made the module a syntax error and failed python-lint. That is fixed, and history is now one clean commit on top of 4027809.

All required checks are green. Locally, ruff==0.15.22 check . passes and all 7 tests in packages/moss-cli/tests/test_documents.py pass. (The two failures in tests/test_completions.py are pre-existing and untouched by this PR; moss-cli tests do not run in CI.)

@r4ghu @ashvathsureshkumar review requests are still pending — ready for another look. @HarshaNalluru your review was dismissed by the force-push; I do not have permission to re-request it from a fork, so flagging here.