feat: make script project-agnostic with configurable directories

- Add --frontend and --backend flags for custom directory paths
- Auto-detect common frontend directory patterns if not specified
- Default backend to repository root if not specified
- Replace hardcoded 'rfc-edge-frontend' with dynamic variables
- Support any project structure with pnpm frontend and Rust backend

Examples:
  check-history.sh 2 4                              # auto-detect
  check-history.sh 2 4 --frontend web --backend .   # custom dirs
  check-history.sh 2 4 --backend server -j8         # no frontend

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

check-history.sh

@@ -4,16 +4,24 @@ set -euo pipefail
 # Usage:
 #   check-history.sh <start_offset> <count> [OPTIONS]
 # Example:
-#   check-history.sh 2 4         # checks commits 2,3,4,5
+#   check-history.sh 2 4                              # checks commits 2,3,4,5
-#   check-history.sh 5 1 -v      # verbose mode
+#   check-history.sh 5 1 -v                           # verbose mode
-#   check-history.sh 2 28 -j4    # check 28 commits, 4 at a time
+#   check-history.sh 2 28 -j4                         # check 28 commits, 4 at a time
+#   check-history.sh 2 4 --frontend web --backend .   # custom directories
 
 VERBOSE=0
 JOBS=1
+FRONTEND_DIR=""
+BACKEND_DIR=""
 
 # Parse arguments
 if [ $# -lt 2 ]; then
-    echo "Usage: $0 <start_offset_from_head> <count> [--verbose|-v] [-j|--jobs N]"
+    echo "Usage: $0 <start_offset_from_head> <count> [OPTIONS]"
+    echo "Options:"
+    echo "  -v, --verbose              Enable verbose debug logging"
+    echo "  -j, --jobs N               Run N jobs in parallel"
+    echo "  --frontend DIR             Frontend directory to build (default: auto-detect)"
+    echo "  --backend DIR              Backend directory to check (default: repository root)"
     exit 1
 fi
 
@@ -40,9 +48,25 @@ while [ $# -gt 0 ]; do
             fi
             shift 2
             ;;
+        --frontend)
+            if [ $# -lt 2 ]; then
+                echo "Error: --frontend requires a directory path" >&2
+                exit 1
+            fi
+            FRONTEND_DIR="$2"
+            shift 2
+            ;;
+        --backend)
+            if [ $# -lt 2 ]; then
+                echo "Error: --backend requires a directory path" >&2
+                exit 1
+            fi
+            BACKEND_DIR="$2"
+            shift 2
+            ;;
         *)
             echo "Error: Unknown option $1" >&2
-            echo "Usage: $0 <start_offset_from_head> <count> [--verbose|-v] [-j|--jobs N]"
+            echo "Usage: $0 <start_offset_from_head> <count> [OPTIONS]"
             exit 1
             ;;
     esac
@@ -55,6 +79,24 @@ debug() {
     fi
 }
 
+# Auto-detect frontend directory if not specified
+if [ -z "$FRONTEND_DIR" ]; then
+    # Try common frontend directory patterns
+    for dir in "frontend" "web" "client" "ui" "app" "*-frontend"; do
+        if [ -d "$dir" ] && [ -f "$dir/package.json" ]; then
+            FRONTEND_DIR="$dir"
+            debug "Auto-detected frontend directory: $FRONTEND_DIR"
+            break
+        fi
+    done
+fi
+
+# Default backend to repository root if not specified
+if [ -z "$BACKEND_DIR" ]; then
+    BACKEND_DIR="."
+    debug "Using repository root as backend directory"
+fi
+
 # Convert user-friendly 1-indexed "Nth from HEAD" into 0-indexed offset
 START_OFFSET="$(( START_ARG - 1 ))"
 COUNT="$COUNT_ARG"
@@ -118,10 +160,12 @@ done
 # Frontend builder
 # -----------------------------
 build_frontend() {
+    local frontend_dir="$1"
+
     (
-        [ "$VERBOSE" -eq 1 ] && echo "[BUILD_DEBUG] Entering rfc-edge-frontend directory" || true
+        [ "$VERBOSE" -eq 1 ] && echo "[BUILD_DEBUG] Entering $frontend_dir directory" || true
-        cd rfc-edge-frontend || {
+        cd "$frontend_dir" || {
-            echo "❌ Failed to cd into rfc-edge-frontend"
+            echo "❌ Failed to cd into $frontend_dir"
             return 1
         }
         [ "$VERBOSE" -eq 1 ] && echo "[BUILD_DEBUG] cd succeeded, PWD=$PWD" || true
@@ -131,9 +175,9 @@ build_frontend() {
         export PNPM_HARD_LINKS=false
 
         # Copy .env file from main repo if it exists and isn't present in worktree
-        if [ ! -f .env ] && [ -f "$REPO_ROOT/rfc-edge-frontend/.env" ]; then
+        if [ ! -f .env ] && [ -f "$REPO_ROOT/$frontend_dir/.env" ]; then
             [ "$VERBOSE" -eq 1 ] && echo "[BUILD_DEBUG] Copying .env file from main repo" || true
-            cp "$REPO_ROOT/rfc-edge-frontend/.env" .env
+            cp "$REPO_ROOT/$frontend_dir/.env" .env
         elif [ -f .env ]; then
             [ "$VERBOSE" -eq 1 ] && echo "[BUILD_DEBUG] .env file already exists in worktree" || true
         else
@@ -218,30 +262,41 @@ check_commit() {
         cd "$worktree"
         [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] In worktree, PWD=$PWD" || true
 
-        if [ -d rfc-edge-frontend ]; then
+        # Build frontend if specified
-            [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Found rfc-edge-frontend directory" || true
+        if [ -n "$FRONTEND_DIR" ]; then
-            echo "→ Building frontend…"
+            if [ -d "$FRONTEND_DIR" ]; then
-            if ! build_frontend; then
+                [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Found $FRONTEND_DIR directory" || true
-                echo "❌ Frontend build failed"
+                echo "→ Building frontend…"
-                exit 1
+                if ! build_frontend "$FRONTEND_DIR"; then
+                    echo "❌ Frontend build failed"
+                    exit 1
+                fi
+                [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Frontend build completed successfully" || true
+            else
+                [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Frontend directory $FRONTEND_DIR not found, skipping" || true
             fi
-            [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Frontend build completed successfully" || true
         else
-            [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] No rfc-edge-frontend directory found, skipping frontend build" || true
+            [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] No frontend directory specified, skipping frontend build" || true
         fi
 
-        # Check if Rust files changed in this commit
+        # Check backend if Rust/Cargo files changed in this commit
-        if git diff --name-only "${commit}^..${commit}" 2>/dev/null | grep -qE '\.(rs|toml)$|Cargo\.lock'; then
+        if [ -n "$BACKEND_DIR" ]; then
-            [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Rust files changed, running cargo check" || true
+            if git diff --name-only "${commit}^..${commit}" 2>/dev/null | grep -qE '\.(rs|toml)$|Cargo\.lock'; then
-            echo "→ Running cargo check…"
+                [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Rust files changed, running cargo check in $BACKEND_DIR" || true
-            if ! cargo check --quiet; then
+                echo "→ Running cargo check…"
-                echo "❌ Cargo check failed"
+                cd "$BACKEND_DIR" || {
-                exit 1
+                    echo "❌ Failed to cd into $BACKEND_DIR"
+                    exit 1
+                }
+                if ! cargo check --quiet; then
+                    echo "❌ Cargo check failed"
+                    exit 1
+                fi
+                [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Cargo check completed successfully" || true
+            else
+                [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] No Rust files changed, skipping cargo check" || true
+                echo "→ Skipping cargo check (no Rust changes)"
             fi
-            [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] Cargo check completed successfully" || true
-        else
-            [ "$VERBOSE" -eq 1 ] && echo "[CHECK_DEBUG] No Rust files changed, skipping cargo check" || true
-            echo "→ Skipping cargo check (no Rust changes)"
         fi
 
         echo "✓ OK"
@@ -258,7 +313,7 @@ TOTAL=${#COMMITS[@]}
 
 # Export functions and variables for parallel execution
 export -f check_commit build_frontend debug
-export VERBOSE REPO_ROOT PNPM_STORE WORKTREES_DIR LOGS_DIR
+export VERBOSE REPO_ROOT PNPM_STORE WORKTREES_DIR LOGS_DIR FRONTEND_DIR BACKEND_DIR
 
 # Process a single commit (for xargs)
 process_commit() {