fix: restore PTY child terminal signal defaults

[seratch]

This pull request fixes Unix-local PTY child signal handling so terminal-generated interrupts are not affected when the parent process is temporarily ignoring terminal signals. It restores SIGINT and SIGQUIT to their default dispositions before the PTY child process execs, and adds regression coverage for Ctrl-C and Ctrl-\ behavior under ignored parent signal handlers.

see also: openai/openai-agents-python#3082

[changeset-bot]

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