feat: add async/await keywords, Num/String extensions, and Jinja markdown example

Add `async` and `await` token support to the Wren compiler with scheduler resolution logic, extend `Num` with `e` constant, hyperbolic trig, base conversion, and new methods (`isZero`, `gcd`, `lcm`, `digits`, etc.), extend `String` with `lower`, `upper`, `capitalize`, `title`, and regenerate `wren_core.wren.inc`. Include `Makefile` for multi-platform builds, rewrite `README.md` with updated build instructions, and add `example/await_demo.wren` and `example/jinja_markdown.wren` demonstrating new features.

example/pathlib_demo.wren

@@ -0,0 +1,167 @@
+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+System.print("=== Pathlib Module Demo ===\n")
+
+System.print("--- Path Construction ---")
+var p = Path.new("/home/user/documents/report.tar.gz")
+System.print("Path: %(p)")
+System.print("Name: %(p.name)")
+System.print("Stem: %(p.stem)")
+System.print("Suffix: %(p.suffix)")
+System.print("Suffixes: %(p.suffixes)")
+System.print("Parts: %(p.parts)")
+
+System.print("\n--- Parent Navigation ---")
+System.print("Parent: %(p.parent)")
+System.print("Parents:")
+for (ancestor in p.parents) {
+    System.print("  %(ancestor)")
+}
+
+System.print("\n--- Path Properties ---")
+System.print("Root: %(p.root)")
+System.print("Anchor: %(p.anchor)")
+System.print("Is absolute: %(p.isAbsolute)")
+var rel = Path.new("relative/path.txt")
+System.print("%(rel) is absolute: %(rel.isAbsolute)")
+
+System.print("\n--- Join Operator (/) ---")
+var base = Path.new("/home/user")
+var config = base / ".config" / "myapp" / "settings.json"
+System.print("%(base) / .config / myapp / settings.json = %(config)")
+
+System.print("\n--- joinpath ---")
+var multi = Path.new("/opt").joinpath(["local", "bin", "wren_cli"])
+System.print("Joined: %(multi)")
+
+System.print("\n--- withName / withStem / withSuffix ---")
+var orig = Path.new("/data/archive.tar.gz")
+System.print("Original: %(orig)")
+System.print("withName(\"backup.zip\"): %(orig.withName("backup.zip"))")
+System.print("withStem(\"snapshot\"): %(orig.withStem("snapshot"))")
+System.print("withSuffix(\".bak\"): %(orig.withSuffix(".bak"))")
+
+System.print("\n--- relativeTo ---")
+var full = Path.new("/home/user/projects/wren/src/main.c")
+var project = Path.new("/home/user/projects/wren")
+System.print("%(full) relative to %(project) = %(full.relativeTo(project))")
+
+System.print("\n--- Glob Matching ---")
+var file = Path.new("/tmp/notes.txt")
+System.print("%(file.name) matches *.txt: %(file.match("*.txt"))")
+System.print("%(file.name) matches *.md: %(file.match("*.md"))")
+System.print("%(file.name) matches note?: %(file.match("note?"))")
+System.print("%(file.name) matches n*s.txt: %(file.match("n*s.txt"))")
+
+System.print("\n--- Home and CWD ---")
+System.print("Home: %(Path.home)")
+System.print("CWD: %(Path.cwd)")
+
+System.print("\n--- Expand User ---")
+var tilde = Path.new("~/.bashrc")
+System.print("%(tilde) -> %(tilde.expanduser())")
+
+System.print("\n--- Equality ---")
+var a = Path.new("/tmp/test")
+var b = Path.new("/tmp/test")
+var c = Path.new("/tmp/other")
+System.print("%(a) == %(b): %(a == b)")
+System.print("%(a) == %(c): %(a == c)")
+System.print("%(a) != %(c): %(a != c)")
+
+System.print("\n--- Filesystem Operations ---")
+var testDir = Path.new("/tmp/wren_pathlib_demo")
+if (testDir.exists()) testDir.rmtree()
+
+testDir.mkdir(true)
+System.print("Created: %(testDir)")
+System.print("Exists: %(testDir.exists())")
+System.print("Is dir: %(testDir.isDir())")
+
+var testFile = testDir / "hello.txt"
+testFile.writeText("Hello from pathlib!")
+System.print("Wrote: %(testFile)")
+System.print("Content: %(testFile.readText())")
+System.print("Is file: %(testFile.isFile())")
+
+System.print("\n--- Stat ---")
+var s = testFile.stat()
+System.print("Size: %(s.size) bytes")
+
+System.print("\n--- Touch ---")
+var marker = testDir / "marker"
+marker.touch()
+System.print("Touched: %(marker) (exists: %(marker.exists()))")
+
+System.print("\n--- Copy ---")
+var copy = testDir / "hello_copy.txt"
+testFile.copyfile(copy)
+System.print("Copied to: %(copy)")
+System.print("Copy content: %(copy.readText())")
+
+System.print("\n--- Rename ---")
+var renamed = testFile.rename(testDir / "greeting.txt")
+System.print("Renamed to: %(renamed)")
+System.print("Old exists: %(testFile.exists())")
+System.print("New content: %(renamed.readText())")
+
+System.print("\n--- Resolve ---")
+var resolved = Path.new(".").resolve()
+System.print("Resolved '.': %(resolved)")
+
+System.print("\n--- Same File ---")
+System.print("Same file: %(renamed.samefile(renamed))")
+
+System.print("\n--- Owner and Group ---")
+System.print("Owner: %(renamed.owner())")
+System.print("Group: %(renamed.group())")
+
+System.print("\n--- Mkdir with Parents ---")
+var deep = testDir / "a" / "b" / "c"
+deep.mkdir(true)
+System.print("Created: %(deep)")
+System.print("Exists: %(deep.exists())")
+
+System.print("\n--- Iterdir ---")
+(testDir / "file1.txt").writeText("one")
+(testDir / "file2.txt").writeText("two")
+var entries = testDir.iterdir()
+System.print("Entries in %(testDir.name):")
+for (entry in entries) {
+    var kind = entry.isDir() ? "dir" : "file"
+    System.print("  %(entry.name) (%(kind))")
+}
+
+System.print("\n--- Glob ---")
+var txtFiles = testDir.glob("*.txt")
+System.print("Text files in %(testDir.name):")
+for (f in txtFiles) {
+    System.print("  %(f.name)")
+}
+
+System.print("\n--- Recursive Glob ---")
+(testDir / "a" / "nested.txt").writeText("nested")
+(testDir / "a" / "b" / "deep.txt").writeText("deep")
+var allTxt = testDir.rglob("*.txt")
+System.print("All text files (recursive):")
+for (f in allTxt) {
+    System.print("  %(f.relativeTo(testDir))")
+}
+
+System.print("\n--- Walk ---")
+System.print("Directory tree:")
+for (entry in testDir.walk()) {
+    var dir = entry[0]
+    var dirs = entry[1]
+    var files = entry[2]
+    var indent = dir == testDir ? "" : "  "
+    System.print("%(indent)%(dir.relativeTo(testDir))/ (%(dirs.count) dirs, %(files.count) files)")
+}
+
+System.print("\n--- Cleanup ---")
+testDir.rmtree()
+System.print("Cleaned up: %(testDir) (exists: %(testDir.exists()))")
+
+System.print("\n=== Demo Complete ===")