fix: Add empty line before result marker for visual continuity (#73)

[konard]

Summary

Fixes the visual continuity issue in docker isolation mode by adding an empty line before the result marker (✓/✗) after command output.

Fixes #73

Problem

When running commands in docker isolation mode, the output lacked visual separation between the command output and the result marker:

Before:

$ docker pull alpine:latest

latest: Pulling from library/alpine
...
docker.io/library/alpine:latest
✓    <-- No empty line before result marker
│

After:

$ docker pull alpine:latest

latest: Pulling from library/alpine
...
docker.io/library/alpine:latest

✓    <-- Empty line added for visual separation
│

Solution

The fix ensures all commands (virtual and actual) follow a consistent visual pattern:

1. Command line ($ ...)
2. Empty line (visual separation)
3. Command output
4. Empty line (visual separation) - this fix
5. Result marker (✓ or ✗)

Changes

• JS: Added console.log() before result marker in docker-utils.js
• Rust: Added println!() before result marker in isolation.rs
• Added tests documenting the expected visual format in both JS and Rust

Test Plan

• Run JS tests: cd js && bun test - 54 tests pass
• Run Rust tests: cd rust && cargo test - 22 output_blocks tests pass
• Visual inspection of expected output format documented in tests

🤖 Generated with Claude Code

[konard]

CI Status Note

The JavaScript CI workflow is currently pending due to a stuck macOS job in a previous run (688f1f5) that has been running for over 2 hours. Multiple cancellation attempts have been made.

Verified locally:

• ✅ All JS tests pass locally (bun test - 54 tests)
• ✅ All Rust tests pass locally (cargo test - all tests pass)
• ✅ Prettier formatting check passes
• ✅ Rust CI passed on GitHub (all platforms: ubuntu, macos, windows)

The fix has been thoroughly tested and should be ready for review once the JS CI completes.

[konard]

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