[R055LE]

Summary

• Add a Reply action to the active running command card, with ordinary and masked entry. Reply uses the current PTY and leaves the next-command draft alone.
• Reject stale or multiline replies, keep reply input out of command history and saved transcript input, and clear transient buffers after sending. Explain that remote echo can still enter the transcript.
• Cover PTY ordering, UI accessibility and restoration, and real SSH echo-off and echo-on cases.

Validation

• ANDROID_HOME=/home/ross/Android/Sdk ./gradlew test lint assembleDebug passed.
• All 37 TranscriptScreenTest instrumented cases passed on the API 35 emulator after the final change.
• Full Android suite passed 134 tests; fixture-gated cases skipped without a supplied fixture credential.
• The new real-SSH reply integration test passed separately with the local OpenSSH fixture.

The existing fixture script still fails in the unrelated raw-terminal bootstrap echo case tracked in #66. The new reply-specific fixture test passed.

Closes #48