fix(tools): make rag file extension detection case-insensitive

[ALDRIN121]

Summary

Fixes #6399

DataTypes.from_content() in lib/crewai-tools/src/crewai_tools/rag/data_types.py matched file extensions case-sensitively against a lowercase-only extension map, so files or URLs with uppercase/mixed-case extensions (Report.PDF, data.CSV, doc.DOCX) were silently misrouted to the plain-text loader (or the website loader for URLs). For a PDF this means raw binary bytes get chunked and embedded into the RAG store instead of parsed document text. Uppercase extensions are common on Windows, scanners, and enterprise document exports.

Changes

• Lowercase the path before the extension comparison in get_file_type() (one-line fix)
• Add tests/rag/test_data_types.py with regression coverage: 12 parametrized file-extension cases (lower/upper/mixed case) plus URL detection cases

Verification

• The new tests fail on main (7 failures — exactly the uppercase/mixed-case inputs) and pass with the fix (14/14)
• Full tests/rag/ + tests/tools/rag/ suite: 176 passed
• ruff check, ruff format, strict mypy, and pre-commit hooks all pass

Input	Before	After
report.PDF	text_file	pdf_file
data.CSV	text_file	csv
doc.DOCX	text_file	docx
https://example.com/file.PDF	website	pdf_file

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📥 Commits

Reviewing files that changed from the base of the PR and between 85c467d and e00bb87.

📒 Files selected for processing (2)

• lib/crewai-tools/src/crewai_tools/rag/data_types.py
• lib/crewai-tools/tests/rag/test_data_types.py

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📝 Walkthrough

Walkthrough

DataTypes.from_content() now performs case-insensitive extension detection. Tests cover local files with multiple suffixes and PDF URLs in uppercase and lowercase.

Changes

RAG file detection

Layer / File(s)	Summary
Normalize extension matching lib/crewai-tools/src/crewai_tools/rag/data_types.py	Lowercases input paths before matching file extensions while preserving the existing type mappings.
Validate case-insensitive detection lib/crewai-tools/tests/rag/test_data_types.py	Adds temporary-file and URL tests covering supported extensions across uppercase, lowercase, and mixed-case forms.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	Title clearly summarizes the case-insensitive RAG extension detection fix.
Description check	✅ Passed	Description matches the bug fix and the added regression tests.
Linked Issues check	✅ Passed	Changes satisfy #6399 by lowercasing paths and adding case-insensitive coverage for files and URLs.
Out of Scope Changes check	✅ Passed	No obvious out-of-scope changes; edits stay within the file-type detection fix and its tests.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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