[AI] Expand Test Coverage - eldritch/lexer

[KCarretto]

This PR expands the test coverage for the eldritch-core lexer by adding a new test file lexer_coverage.rs. It targets specific edge cases and complex behaviors identified in the codebase, such as compound assignment splitting, integer overflow, and error recovery during indentation processing.

Changes:

• Created implants/lib/eldritch/eldritch-core/tests/lexer_coverage.rs.
• Added tests for:
  • &=, |=, ^=, <<=, >>=, **= tokenization.
  • i64 overflow defaulting to 0.
  • Recovery from inconsistent indentation errors.
  • Prioritization of outer string errors over nested f-string errors.
  • Parsing of triple-quoted strings containing quotes.
  • Tokenization of scientific notation and trailing dots.

Verification:

• Ran cargo test -p eldritch-core --test lexer_coverage 20 times (all passed).
• Ran all eldritch-core tests (all passed).
• Ran cargo fmt.

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PR created automatically by Jules for task 12137570754510437408 started by @KCarretto

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[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2582    ±0	2582    ±0	0    ±0	0    ±0	0    ±0	0    ±0	1ms    ±0

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#863	✅	2582	2582	0	0	0	0	18.7s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2582	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
imix::bin/imix: install::tests::test_install_execution	3	1.2s	3.4s
imix::bin/imix: install::tests::test_install_execution	3	1.2s	3.4s
imix::bin/imix: install::tests::test_install_execution	3	1.2s	3.4s
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
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

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

Github Test Reporter by CTRF 💚