Shell: only its own replies, Apps by their names, and rm as Unix has it (#67)

The Shell shows the replies to its own commands and nothing else. The
console knows who each line is printed for (Console::As, Console::origin):
a command run from the Shell prints as the Shell's, and what answers it
later from another task carries that along (ls, tasks, du, cp, update
check, sd list, screenshot, gemini get). Ctrl+b shows everything instead.
This replaces the ten-second window, which was a guess.

An App's name with a capital opens it (Notes, Irc, Wifi, Gnss, Gemini, Lora,
Storage, Shell, System, Settings), from the Shell and from the consoles.

rm needs -r for a folder, here and over the consoles. In the Shell a file,
or a folder with something in it, is asked about unless -f; an empty folder
with -r goes without a word.

The Shell now hands its line to the main loop to run: run from inside the
key handler, rm on a folder overflowed the loop's stack and crashed the
device. `info` says which App is in front.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

lib/core/src/app_keys.h

@@ -329,12 +329,13 @@ inline constexpr KeyHelp kShell[] = {
     {"Tab", "complete the command"},
     {"Fn ; .", "lines you typed before"},
     {"Alt ; .", "scroll back, forward"},
-    {"Ctrl b", "all output, or only yours"},
+    {"Ctrl b", "your replies only, or all"},
     {"Fn , /", "move the cursor"},
     {"Del", "delete backwards"},
     {"help", "every command"},
     {"clear", "an empty screen"},
-    {"rm -f", "delete without being asked"},
+    {"Notes", "an App, by its name"},
+    {"rm -rf", "delete without being asked"},
     {"quit  `", "leave the Shell"},
 };