feat(flow): add git sync command

config/shared/bin/flow

@@ -21,6 +21,11 @@ SPEC=(
   "argument;ssh-args;type:rest;dest:ssh_args;help:Additional SSH arguments (after --)"
   "end"
 
+  "command;sync;Git tools"
+  "command;check;Check all projects status"
+  "end"
+  "end"
+
   "command;create;Create and start a new development container"
   "argument;image,i;required;type:option;help:Container image to use (with optional tag)"
   "argument;project,p;type:option;help:Path to local project directory"
@@ -220,6 +225,90 @@ cmd_enter() {
   exec "${ssh_cmd[@]}"
 }
 
+# shellcheck disable=SC2154,SC2155
+cmd_sync_check() {
+  local base_dir="$HOME/projects"
+  local -a needs_action=()
+
+  for repo in "$base_dir"/*; do
+    local git_dir="$repo/.git"
+    if [ -e "$git_dir" ]; then
+      echo "=== $(basename "$repo") ==="
+
+      # Disable immediate exit inside the conditional block
+      if (
+        cd "$repo" || exit 1
+        local action_required=0
+
+        git fetch --all --quiet || true
+
+        # Uncommitted changes
+        if ! git diff --quiet || ! git diff --cached --quiet; then
+          echo "Uncommitted changes:"
+          git status --short
+          action_required=1
+        else
+          echo "No uncommitted changes."
+        fi
+
+        branch=$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo "HEAD")
+
+        # Unpushed commits
+        if git rev-parse --abbrev-ref "${branch}@{u}" >/dev/null 2>&1; then
+          unpushed=$(git log --oneline "${branch}@{u}..${branch}")
+          if [ -n "$unpushed" ]; then
+            echo "Unpushed commits on ${branch}:"
+            echo "$unpushed"
+            action_required=1
+          else
+            echo "No unpushed commits on ${branch}."
+          fi
+        else
+          echo "No upstream set for ${branch}."
+          action_required=1
+        fi
+
+        # Unpushed branches
+        branches=$(git for-each-ref --format='%(refname:short)' refs/heads)
+        unpushed_branches=()
+        for b in $branches; do
+          if git rev-parse --abbrev-ref "${b}@{u}" >/dev/null 2>&1; then
+            ahead=$(git rev-list --count "${b}@{u}..${b}")
+            if [ "$ahead" -gt 0 ]; then
+              unpushed_branches+=("$b ($ahead ahead)")
+            fi
+          else
+            unpushed_branches+=("$b (no upstream)")
+          fi
+        done
+
+        if [ "${#unpushed_branches[@]}" -gt 0 ]; then
+          echo "Unpushed branches:"
+          printf '  %s\n' "${unpushed_branches[@]}"
+          action_required=1
+        else
+          echo "No unpushed branches."
+        fi
+
+        echo
+        exit "$action_required"
+      ); then
+        :
+      else
+        needs_action+=("$(basename "$repo")")
+      fi
+    fi
+  done
+
+  echo "=== SUMMARY ==="
+  if [ "${#needs_action[@]}" -gt 0 ]; then
+    echo "Projects needing action:"
+    printf '  %s\n' "${needs_action[@]}" | sort -u
+  else
+    echo "All repositories clean and synced."
+  fi
+}
+
 # shellcheck disable=SC2154,SC2155
 cmd_create() {
   # VARS: name_arg, image_arg, project_arg