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Fix libc termios ABI mismatch in password-mode detection - #781
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Summary
Fixes #780.
Use the C-imported
termiosstruct together withc.tcgetattrin password-mode detection, matchingPosixPtyProcess.zig. This avoids passing Zig's kernel-layout termios storage to libc, which can overwrite the stack on Linux. ReadICANONandECHOusing the corresponding C constants rather than adding padding around the mismatched type.Add POSIX PTY tests covering all canonical/echo combinations, missing paths, and non-TTY paths. Register them only in the non-Windows test branch.
Verification
zig fmtandgit diff --checkpassed.