fix(installer): repair git init, LUKS reprompt, impermanence-no exit, quiet disko

- nrun git git init -q passed 'git' as a subcommand to git itself,
  failing the post-disko repo init. Drop the duplicated arg.
- disko's luks module reads passwordFile at the top level; placing it
  under settings.* meant it was silently ignored and disko fell back
  to askPassword=true, prompting the user again on luksOpen. Move the
  option to the right scope.
- configure_impermanence now uses local rc, nrun gum confirm, and an
  explicit case (0/1/130) with a final return 0 so a No answer no
  longer aborts the installer.
- run_disko_with_retry hides disko's chatty output behind a gum spin
  by default and surfaces the captured log on failure. Set
  NOMARCHY_VERBOSE_DISKO=1 to stream output live.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

installer/install.sh

@@ -869,17 +869,27 @@ configure_impermanence() {
     info "This provides a clean, reproducible system."
     echo ""
 
-    rc=0
-    gum confirm "Enable Impermanence?" || rc=$?
-    if [[ $rc -eq 0 ]]; then
-        ENABLE_IMPERMANENCE="true"
-        success "Impermanence enabled"
-    else
-        if [[ $rc -eq 130 ]]; then return 130; fi
-        ENABLE_IMPERMANENCE="false"
-        info "Impermanence disabled (traditional persistent root)"
-    fi
+    local rc=0
+    nrun gum confirm "Enable Impermanence?" || rc=$?
+    case "$rc" in
+        0)
+            ENABLE_IMPERMANENCE="true"
+            success "Impermanence enabled"
+            ;;
+        1)
+            ENABLE_IMPERMANENCE="false"
+            info "Impermanence disabled (traditional persistent root)"
+            ;;
+        130)
+            return 130
+            ;;
+        *)
+            ENABLE_IMPERMANENCE="false"
+            info "Impermanence disabled (traditional persistent root)"
+            ;;
+    esac
     save_state
+    return 0
 }
 
 # ============================================================================
@@ -1084,6 +1094,10 @@ _LUKS_KEY_PATH="/dev/shm/nomarchy-luks.key"
 # Wrap the disko invocation so a failure surfaces the last few lines of
 # output and offers Retry / View full log / Abort. set -e is suspended for
 # the disko call so we can inspect its exit code; restored on every path.
+#
+# By default disko's chatty output is hidden behind a `gum spin` spinner;
+# the full log is captured and shown on failure or via `gum pager`. Set
+# NOMARCHY_VERBOSE_DISKO=1 to stream disko output live instead.
 run_disko_with_retry() {
     local main_drive="$1"
     local extras_nix="$2"
@@ -1093,13 +1107,33 @@ run_disko_with_retry() {
 
     while true; do
         local rc=0
-        set +e
-        disko --mode destroy,format,mount \
-              --argstr mainDrive "$main_drive" \
-              --arg    extraDrives "$extras_nix" \
-              "$disko_file" 2>&1 | tee "$log"
-        rc=${PIPESTATUS[0]}
-        set -e
+        if [[ "$NOMARCHY_VERBOSE_DISKO" == "1" ]]; then
+            set +e
+            disko --mode destroy,format,mount \
+                  --argstr mainDrive "$main_drive" \
+                  --arg    extraDrives "$extras_nix" \
+                  "$disko_file" 2>&1 | tee "$log"
+            rc=${PIPESTATUS[0]}
+            set -e
+        else
+            # Silent path: run disko in the background, write all output to
+            # $log, and show a spinner. Use a status file for the exit code
+            # because `gum spin` doesn't propagate the wrapped command's rc.
+            local status_file
+            status_file=$(mktemp --suffix=.disko.rc)
+            set +e
+            nrun gum spin --spinner dot --title "Partitioning disk(s) with disko..." -- \
+                bash -c '
+                    disko --mode destroy,format,mount \
+                          --argstr mainDrive "$1" \
+                          --arg    extraDrives "$2" \
+                          "$3" > "$4" 2>&1
+                    echo $? > "$5"
+                ' _ "$main_drive" "$extras_nix" "$disko_file" "$log" "$status_file"
+            set -e
+            rc=$(cat "$status_file" 2>/dev/null || echo 1)
+            rm -f "$status_file"
+        fi
 
         if [[ $rc -eq 0 ]]; then
             rm -f "$log"
@@ -1197,11 +1231,11 @@ execute_installation() {
     info "Initializing git repository..."
     (
         cd /mnt/etc/nixos
-        nrun git git init -q
-        nrun git git add .
-        nrun git git config user.name "Nomarchy Installer"
-        nrun git git config user.email "installer@nomarchy"
-        nrun git git commit -qm "Initial Nomarchy configuration"
+        nrun git init -q
+        nrun git add .
+        nrun git config user.name "Nomarchy Installer"
+        nrun git config user.email "installer@nomarchy"
+        nrun git commit -qm "Initial Nomarchy configuration"
     )
     success "Git repository initialized"