[AI] Expand Test Coverage - dsl/parser

[KCarretto]

Added a new test file implants/lib/eldritch/eldritch-core/tests/parser_edge_cases.rs covering complex parser edge cases including chained comparisons, operator precedence, slicing syntax, and f-string nesting. Also exported Expr struct in lib.rs to facilitate these tests.

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PR created automatically by Jules for task 7466085284993880548 started by @KCarretto

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[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2613    ±0	2613    ±0	0    ±0	0    ±0	0    ±0	0    ±0	1ms    ±0

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#989	✅	2613	2613	0	0	0	0	21.7s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2613	0	0	5.2s

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
eldritch-libsys: std::dll_inject_impl::tests::test_dll_inject_simple	1	5.2s	5.2s
TestDockerExecutor_Build_ContextCancellation	1	5.2s	5.2s
imix::bin/imix: install::tests::test_install_execution	3	1.1s	3.3s
imix::bin/imix: install::tests::test_install_execution	3	1.1s	3.3s
imix::bin/imix: install::tests::test_install_execution	3	1.1s	3.3s
imix::bin/imix: tests::task_tests::test_task_streaming_error	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_error	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_error	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 💚