fix(get): force literal tree lookup

[moomooskycow]

Intent

Close the post-merge review finding on PR #43: Git pathspec magic must not affect missing-path classification.

Decision

Prefix the diagnostic git ls-tree path with :(literal). The user path remains a literal repository path even when it begins with Git pathspec syntax.

Checks

• Regression: :(literal)README.md is absent and returns not_found even though README.md exists.
• Invalid snapshot remains a repository failure, not not_found.
• ./scripts/check.sh: passed.

Rollback

Revert this PR to restore pathspec interpretation in the diagnostic lookup.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-01T23:02:46.599744Z	85e87ff	PR opened

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📥 Commits

Reviewing files that changed from the base of the PR and between cd4da42 and 85e87ff.

📒 Files selected for processing (2)

• internal/kernel/read.go
• internal/kernel/read_refresh_test.go

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