[JheisonMB]

The last features before the first release, plus the README.

• Scheduling. The Prompt Builder gains Schedule (date and time), lists the session's pending schedules and cancels one. Needs the matching host frames in harness-canopy #63.
• Copy. A sheet with the terminal's text in a native textarea, where the phone's own selection works, plus a floating Copy button and Ctrl+Shift+C with a mouse. Plain Ctrl+C stays an interrupt.
• Latches. Ctrl and Shift disarmed before the first key on a phone: tapping the terminal fired xterm's focus report, which consumed the latch. Reports no longer touch a latch, arming a latch opens the keyboard, and the bar no longer steals focus.
• README. Banner, badges and links, like Canopy's.

Not tested on a real phone: Playwright at 360×640 only. The controls row now holds eight 44 px buttons and scrolls sideways on a phone instead of wrapping.