feat: Add python syntax highlighting to ShellV2

[KCarretto]

Implemented a regex-based Python syntax highlighter in shellUtils.ts and integrated it into useShellTerminal.ts.

• Highlights keywords (Magenta), strings (Green), comments (Grey), and numbers (Yellow).
• Updated redrawLine to apply highlighting to the input buffer.
• Removed "fast path" optimizations in onData to ensure highlighting updates on every keystroke.
• Added comprehensive unit tests in shellUtils.test.ts.
• Updated frontend build artifacts (tavern/internal/www/build/) as they are tracked in the repository.

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PR created automatically by Jules for task 15972764486569407497 started by @KCarretto

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[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2698    ±0	2698    ±0	0    ±0	0    ±0	0    ±0	0    ±0	1ms    ±0

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#1320	✅	2698	2698	0	0	0	0	44.3s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2698	0	0	5.7s

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
TestDockerExecutor_Build_ContextCancellation	1	5.7s	5.7s
eldritch-libsys: std::dll_inject_impl::tests::test_dll_inject_simple	1	5.1s	5.1s
TestInteractiveShell	1	5.1s	5.1s
TestOtherStreamOutput	1	5.0s	5.0s
imix::bin/imix: install::tests::test_install_execution	3	1.6s	4.7s
imix::bin/imix: install::tests::test_install_execution	3	1.6s	4.7s
imix::bin/imix: install::tests::test_install_execution	3	1.6s	4.7s
imix::bin/imix: tests::task_tests::test_task_streaming_output	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_output	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_output	3	3.0s	3.0s

_{🎉 No failed tests in this run. | 🍂 No flaky tests in this run.}

Github Test Reporter by CTRF 💚

[KCarretto]

looks good to me!

[google-labs-jules]

looks good to me!

Thanks for the verification! Glad it looks good.