chore(git): add .gitattributes with LF line ending normalization

[algorithmpoet]

Summary

• Add .gitattributes file to enforce LF line endings for all text files
• Sets * text=auto eol=lf as the global default for automatic normalization
• Explicitly declares common text file types (.md, .json, .yaml, .yml, .toml, .py, .js, .cjs, .ts, .sh, etc.) with eol=lf
• Marks binary files (images, archives) to prevent modification

Motivation

Without .gitattributes, contributors on Windows may commit files with CRLF line endings, causing noisy diffs and potential CI failures. This file ensures consistent LF endings across all platforms and contributors.

Build and test results

• mise run build — PASSED (lint, fmt:check, validate, security all green)
• mise run lint — PASSED
• No test suite failures; this is a configuration-only change

Decisions made

• Used * text=auto eol=lf as the catch-all rule so Git auto-detects text vs. binary files and normalizes to LF
• Explicitly listed common text extensions for clarity and to override any ambiguity
• Binary extensions (images, archives) are marked binary to prevent any line-ending conversion

Agent notes

What went well: The task was straightforward — the repo had no existing .gitattributes, so there were no conflicts. The mise run build command provided a convenient one-stop check for lint, formatting, validation, and security.

What was difficult: Nothing significant — clean codebase with well-organized tooling.

Patterns/conventions discovered:

• The repo uses mise for all task running; always use mise run <task> rather than raw tool commands
• Commit messages follow conventional commits format: <type>(<module>): description
• The build task runs lint + fmt:check + validate + security in sequence
• dprint is used for formatting; .gitattributes is not a file type dprint touches, so no fmt issues

Suggestions for future tasks:

• Consider adding .editorconfig alongside .gitattributes for consistent editor settings
• The mise run pre-commit task runs pre-commit hooks — worth verifying hooks include line-ending checks after this change

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

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