fix: run renovate-deps for deleted tracked files

[zeitlinger]

Blocked by #253

Summary

Fixes adaptive renovate-deps relevance when the only relevant change is deleting a file that is still tracked in .github/renovate-tracked-deps.json.

The changed-path collection now preserves deleted paths, and renovate-deps uses the raw changed path list for relevance instead of only existing files.

Validation

• cargo fmt -- --check
• git diff --check
• cargo test renovate_deps
• FLINT_CASES=renovate-deps/fast-only cargo test cases

Note: FLINT_CASES=renovate-deps cargo test cases was attempted, but non-fake renovate fixtures need renovate installed on PATH.

[Copilot]

Pull request overview

This PR fixes renovate-deps relevance detection when the only relevant change is the deletion of a file that remains referenced in .github/renovate-tracked-deps.json, ensuring the linter still runs in --fast-only mode.

Changes:

• Preserve deleted paths in git changed-path collection by no longer filtering deletions out of git diff --name-only.
• Update renovate-deps relevance logic to use the raw changed-path list (including deletions) and normalize path separators.
• Add unit + Unix e2e coverage to validate renovate-deps runs when a tracked manifest is deleted.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/e2e.rs	Adds a Unix-only e2e test ensuring renovate-deps runs when a tracked manifest (package.json) is deleted.
src/linters/renovate_deps.rs	Switches relevance to use changed_paths (supporting deletions) and introduces path normalization; adds unit test for deleted tracked manifest relevance.
src/files.rs	Stops excluding deleted files from git diff --name-only results so deleted paths are preserved in changed_paths.

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