feat(test): configurable -t fd terminal detection#818
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Make -t fd (terminal test) configurable via _TTY_N variables. Defaults to false for all FDs (correct for sandboxed VFS execution). Set _TTY_0=1, _TTY_1=1, etc. to simulate terminal mode. Works in both [ -t ] and [[ -t ]] syntax. Closes #799
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Summary\n\n- Make
-t fdconfigurable via_TTY_Nvariables (e.g._TTY_0=1for stdin)\n- Defaults to false for all FDs (correct for sandboxed VFS execution)\n- Works in both[ -t ]and[[ -t ]]syntax\n\nCloses #799\n\n## Test plan\n\n- [x]-t 0defaults to false\n- [x]-t 1defaults to false\n- [x]_TTY_1=1makes-t 1return true\n- [x][[ -t 0 ]]works\n- [x][[ -t 1 ]]respects_TTY_1variable\n- [x] All tests green