fix: Remove empty line after virtual command to maintain visual continuity

[konard]

🎯 Summary

This PR fixes the visual continuity break in docker pull output by removing an empty line that appeared between the timeline marker (│) and the virtual command line ($ docker pull).

📋 Issue Reference

Fixes #73

🔍 Problem

When running commands with docker isolation (e.g., $ --isolated docker -- echo 'hi'), there was an empty line breaking visual continuity:

│

$ docker pull alpine:latest

This made the output harder to read and broke the visual flow of the timeline format.

✅ Solution

Removed the console.log() / println!() call that was outputting an empty line after the virtual command block in both JavaScript and Rust implementations.

Changes Made

1. JavaScript (js/src/lib/docker-utils.js:120):

   • Removed empty console.log() call after virtual command output

2. Rust (rust/src/lib/isolation.rs:490):

   • Removed empty println!() call after virtual command output

3. Test Script (experiments/test-docker-pull-output.js):

   • Added test to verify output format is correct

4. Changelog Entries:

   • Added js/.changeset/fix-visual-continuity-73.md for JavaScript
   • Added rust/changelog.d/73.md for Rust

🧪 Testing

• ✅ All existing JavaScript tests pass
• ✅ All existing Rust tests pass
• ✅ Created and verified test script showing correct output format
• ✅ Output now flows continuously from timeline marker to command to output

Before

│

$ docker pull alpine:latest

latest: Pulling from library/alpine
...

After

│
$ docker pull alpine:latest
latest: Pulling from library/alpine
...

📝 Notes

• This fix maintains visual continuity in the timeline format
• Applies to all virtual command blocks (currently docker pull operations)
• No changes to functionality, only output formatting
• Both JavaScript and Rust implementations have been updated consistently

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[konard]

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