Fix the review's findings in the test harness

Headset smoke test: drop the paired key from authorized_keys with a
same-mode copy swapped in, so a failed write can't truncate it; check the
throwaway key with no ssh_config or agent; clean up idempotently (tracked
and leftover titles, their json files, Steam's shortcuts via steamos-delete,
and ~/devkit-utils if it wasn't there before), with a failed cleanup a
failed step; count a launch only with fresh evidence (the process, Steam's
log, or the known missing-runtime line), matching with [d]evkit-game so
pgrep doesn't find its own shell. The test programs sleep 10 s.

Fake Frame: log a launch before its reaper can look for it. e2e: kill a
pairing client's process group when a test ends; accept an aarch64 program
running under QEMU on x86 hosts.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/smoke/tiny_programs.py

@@ -11,7 +11,7 @@ smoke test and the fake Frame's e2e tests install. Python stdlib only.
 """
 import struct
 
-SLEEP_SECONDS = 5
+SLEEP_SECONDS = 10
 BASE = 0x400000