[Lean Squad] feat(fv): Task 1 — expand TARGETS.md to 17 targets; add LLMEnvironmentDetector research#8115

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mainmicrosoft/testfx:mainfrom

lean-squad/run14-task1-targets-update-2026-05-11-5dc032362e20517cmicrosoft/testfx:lean-squad/run14-task1-targets-update-2026-05-11-5dc032362e20517cCopy head branch name to clipboard