A REPL paste's Enter waits on the clock, not on stale core time

sendToRepl timed the Enter's fallback from stepped_ns, which in an idle
detached session is as old as the last frame: the wait was over before it
began and the \r went out with the paste, which 3.13's REPL then reads as
part of it (4 of 5 sends lost their Enter). The wait now starts from the
host's clock and is checked against now_ns; the REPL's echo of the paste
still sends it sooner, and the wake is scheduled for the deadline. fs.py
sends five times after two idle seconds each in a real pty.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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