Force LF on the mapping TSVs whose hashes tests check

[s28ale-maker]

Standalone PR, not part of the stacked series (#15–#23). It can merge independently in any order.

Summary

Adds a .gitattributes that pins two files to LF line endings:

mappings/soulcap_entities.tsv  text eol=lf
mappings/curated_mappings.tsv  text eol=lf

tests/test_benchmark_reserve.py checks the SHA-256 of both files against the values frozen in mappings/benchmark_reserve.json. On Windows with core.autocrlf=true, Git checks them out with CRLF line endings, which changes the bytes, so the test fails locally even though the committed content is correct and CI (Linux, LF) passes.

The committed file content doesn't change. Only how Windows checkouts write the files changes. mappings/ arrives with part 6 of the stack (#20); a rule for a path that doesn't exist yet is harmless.

After merging: refresh your local copies once

Git doesn't rewrite files already checked out, so re-check-out the two files once.

Bash / Git Bash:

rm mappings/soulcap_entities.tsv mappings/curated_mappings.tsv && git checkout -- mappings/

PowerShell:

Remove-Item mappings/soulcap_entities.tsv, mappings/curated_mappings.tsv; git checkout -- mappings/

Test plan

• Verified on the tip of the stack (pr-09-species-pilot) on Windows with core.autocrlf=true: both files check out LF and tests/test_benchmark_reserve.py passes. Without this file, it fails with a hash mismatch.
• On this branch (off main): uv run pytest passes with UTF-8 mode (121 passed, 94.5% coverage), and uv run ruff check . passes. Two tests on main fail locally on Windows because of a missing encoding="utf-8", which Add soulcap-lookup, soulcap-tokens, type checking, and CI improvements #15 fixes; they're unrelated to this change.
• CI passes on this PR

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