Offer to send the log to us when an install or update fails

When update or install.sh fails and there's a terminal, ask whether to
send its log to the CoreDesktop team, with the option of reading exactly
what would be sent first. Nothing is sent without a yes, and nothing is
asked without a terminal. The new report command sends a log later
(report, report FILE) or shows what would be sent (report --view).

Before sending, the log is cleaned of terminal codes, and the home
folder, user name, host name, email addresses, IPv4 addresses and
Tailscale names are replaced. CoreDesktop's version, the kernel's, the
failed steps and sibling versions go along with it. The request format
the receiver on federated.sh implements is described at the top of
report.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

install.sh

@@ -27,6 +27,7 @@ cd
 if mkdir -p -m 700 "$HOME/.local/state/coredesktop/logs"; then
   INSTALL_LOG="$HOME/.local/state/coredesktop/logs/install-$(date +%Y-%m-%d-%H%M%S).log"
   exec > >(tee -a "$INSTALL_LOG") 2>&1
+  TEE_PID=$!
 fi
 
 # Exit on any error
@@ -66,6 +67,17 @@ on_exit() {
   kill "$SUDO_KEEPALIVE_PID" 2> /dev/null
   if (( status != 0 )) && [ -n "$INSTALL_LOG" ]; then
     echo "The install stopped with an error. The full output is in $INSTALL_LOG"
+    # Offer to send the log to us, once tee has written all of it (a second at
+    # most). report asks on the terminal, so this needs one.
+    local report="$HOME/.local/share/coredesktop/report" i
+    if [ -f "$report" ] && { : < /dev/tty; } 2> /dev/null; then
+      exec > /dev/tty 2>&1
+      for (( i = 0; i < 10; i++ )); do
+        kill -0 "$TEE_PID" 2> /dev/null || break
+        sleep 0.1
+      done
+      bash "$report" --offer "$INSTALL_LOG" install.sh
+    fi
   fi
 }
 trap on_exit EXIT
@@ -91,7 +103,7 @@ cd ~/.local/share/coredesktop
 # Source utility functions (provides install_packages and other helpers)
 source utils.sh
 
-# Install the refresh, update, sibling, version, configure and audit scripts to the user's bin
+# Install the refresh, update, sibling, version, configure, audit and report scripts to the user's bin
 mkdir -p ~/.local/bin
 install_script ~/.local/share/coredesktop/refresh ~/.local/bin/refresh
 install_script ~/.local/share/coredesktop/update ~/.local/bin/update
@@ -99,6 +111,7 @@ install_script ~/.local/share/coredesktop/sibling ~/.local/bin/sibling
 install_script ~/.local/share/coredesktop/version ~/.local/bin/version
 install_script ~/.local/share/coredesktop/configure ~/.local/bin/configure
 install_script ~/.local/share/coredesktop/audit ~/.local/bin/audit
+install_script ~/.local/share/coredesktop/report ~/.local/bin/report
 
 # Source the package list (defines SYSTEM_UTILS, DEV_TOOLS, DESKTOP, etc. arrays)
 if [ ! -f "packages.conf" ]; then