rebuild dev and build system with single marp server

- simplify development: single marp server on port 3000 instead of 3 processes
- rename klausur to klausurfolien for better naming
- update extract script to use 00-intro.md as template when no 01-*.md exists
- update makefile and package.json for new workflow
- add comprehensive AGENTS.md guidelines

scripts/extract-klausur.sh

@@ -1,19 +1,19 @@
 #!/usr/bin/env bash
 # Extract klausur-relevant slides from all kapitel
 # Usage: ./extract-klausur.sh <course_id>
-# Output: slides/<course>/klausur.md
+# Output: slides/<course>/klausurfolien.md
 
 set -e
 
 COURSE="${1:-223015b}"
 SLIDES_DIR="slides/$COURSE"
-OUTPUT_FILE="$SLIDES_DIR/klausur.md"
+OUTPUT_FILE="$SLIDES_DIR/klausurfolien.md"
 
-# Find the first kapitel file (01-*.md) to copy styles from
-FIRST_KAPITEL=$(ls "$SLIDES_DIR"/01-*.md 2>/dev/null | head -1)
+# Find the first kapitel file (00-intro.md or 01-*.md) to copy styles from
+FIRST_KAPITEL=$(ls "$SLIDES_DIR"/00-intro.md "$SLIDES_DIR"/01-*.md 2>/dev/null | head -1)
 
 if [[ -z "$FIRST_KAPITEL" ]]; then
-  echo "Error: No 01-*.md file found in $SLIDES_DIR"
+  echo "Error: No 00-intro.md or 01-*.md file found in $SLIDES_DIR"
   exit 1
 fi
 
@@ -57,7 +57,7 @@ awk '
 ' "$FIRST_KAPITEL" >> "$OUTPUT_FILE"
 
 # Process each kapitel file in order - extract klausur slides only
-for md_file in $(ls "$SLIDES_DIR"/[0-9][0-9]-*.md 2>/dev/null | grep -v klausur | sort); do
+for md_file in $(ls "$SLIDES_DIR"/[0-9][0-9]-*.md 2>/dev/null | grep -v klausurfolien | sort); do
   filename=$(basename "$md_file")
   kapitel_num=$(echo "$filename" | grep -oE '^[0-9]+' | sed 's/^0*//')