Fix #1071

[PicoJr]

Summary

• Fix rtk git show differ from git show on binary files #1071
• it only fixes rtk git show <rev>:<path>
• rtk git show <rev> without the : where <rev> corresponds to a binary blob still produces incorrect filtered content

Test plan

• Manual testing: rtk <command> output inspected

rtk on  fix-1071 is 📦 v0.34.3 via 🦀 v1.92.0 
❯ git show ca7fbeb:test.bin | md5sum
3df17d08f5e181ff83982d9334a58579  -

rtk on  fix-1071 is 📦 v0.34.3 via 🦀 v1.92.0 
❯ ./target/debug/rtk git show ca7fbeb:test.bin | md5sum
3df17d08f5e181ff83982d9334a58579  -

AI Use disclosure:

• I used AI to analyze the code and write the fix
• I reviewed the code and tested the fix manually
• I also used AI to do additional code review
• This PR was written manually without the use of AI

I ran cargo fmt --all && cargo clippy --all-targets && cargo test on my commit

[CLAassistant]

All committers have signed the CLA.

[pszymkowiak]

[w] wshm · Automated triage by AI

📊 Automated PR Analysis

🐛 Type	bug-fix
🟢 Risk	low

Summary

Fixes issue #1071 where rtk git show <rev>:<path> produced incorrect filtered content for binary blobs. The fix passes binary blob shows directly through to git instead of capturing and printing the output, preserving binary data integrity. The issue of rtk git show <rev> (without colon) for binary blobs remains unresolved.

Review Checklist

• Tests present
• Breaking change
• Docs updated

Linked issues: #1071

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Analyzed automatically by wshm · This is an automated analysis, not a human review.