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.

test/pathlib/copyfile.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var dir = Path.new("/tmp/wren_pathlib_test_copy")
+if (dir.exists()) dir.rmtree()
+dir.mkdir()
+
+var src = dir / "original.txt"
+src.writeText("copy me")
+
+var dst = dir / "copied.txt"
+src.copyfile(dst)
+
+System.print(dst.exists()) // expect: true
+System.print(dst.readText()) // expect: copy me
+
+dir.rmtree()

test/pathlib/cwd_home.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var cwd = Path.cwd
+System.print(cwd.isAbsolute) // expect: true
+System.print(cwd.exists()) // expect: true
+System.print(cwd.isDir()) // expect: true
+
+var home = Path.home
+System.print(home.isAbsolute) // expect: true
+System.print(home.exists()) // expect: true

test/pathlib/equality.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var p1 = Path.new("/home/user")
+var p2 = Path.new("/home/user")
+var p3 = Path.new("/home/other")
+
+System.print(p1 == p2) // expect: true
+System.print(p1 != p3) // expect: true
+System.print(p1 == p3) // expect: false

test/pathlib/exists.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var p1 = Path.new("/tmp")
+System.print(p1.exists()) // expect: true
+System.print(p1.isDir()) // expect: true
+System.print(p1.isFile()) // expect: false
+
+var p2 = Path.new("/nonexistent_path_xyz_12345")
+System.print(p2.exists()) // expect: false
+System.print(p2.isDir()) // expect: false
+System.print(p2.isFile()) // expect: false

test/pathlib/expanduser.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var home = Path.home
+var expanded = Path.new("~").expanduser()
+System.print(expanded == home) // expect: true
+
+var subpath = Path.new("~/docs").expanduser()
+var expected = home / "docs"
+System.print(subpath == expected) // expect: true
+
+var regular = Path.new("/usr/local").expanduser()
+System.print(regular) // expect: /usr/local

test/pathlib/glob.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var base = Path.new("/tmp/wren_pathlib_test_glob")
+if (base.exists()) base.rmtree()
+base.mkdir(true)
+
+(base / "a.txt").writeText("a")
+(base / "b.txt").writeText("b")
+(base / "c.md").writeText("c")
+var sub = base / "sub"
+sub.mkdir()
+(sub / "d.txt").writeText("d")
+
+var txtFiles = base.glob("*.txt")
+System.print(txtFiles.count) // expect: 2
+
+var allTxt = base.rglob("*.txt")
+System.print(allTxt.count) // expect: 3
+
+base.rmtree()

test/pathlib/iterdir.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var dir = Path.new("/tmp/wren_pathlib_test_iterdir")
+if (dir.exists()) dir.rmtree()
+dir.mkdir()
+
+(dir / "a.txt").writeText("a")
+(dir / "b.txt").writeText("b")
+(dir / "sub").mkdir()
+
+var entries = dir.iterdir()
+System.print(entries.count) // expect: 3
+
+var names = {}
+for (e in entries) {
+    names[e.name] = true
+}
+System.print(names.containsKey("a.txt")) // expect: true
+System.print(names.containsKey("b.txt")) // expect: true
+System.print(names.containsKey("sub")) // expect: true
+
+dir.rmtree()

test/pathlib/joinpath.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var p1 = Path.new("/home")
+var p2 = p1.joinpath("user")
+System.print(p2) // expect: /home/user
+
+var p3 = p1 / "user" / "docs"
+System.print(p3) // expect: /home/user/docs
+
+var p4 = p1.joinpath("/absolute")
+System.print(p4) // expect: /absolute
+
+var p5 = Path.new("").joinpath("file.txt")
+System.print(p5) // expect: file.txt
+
+var p6 = Path.new("/home/").joinpath("user")
+System.print(p6) // expect: /home/user

test/pathlib/match.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var p1 = Path.new("/home/user/file.txt")
+System.print(p1.match("*.txt")) // expect: true
+System.print(p1.match("*.py")) // expect: false
+System.print(p1.match("file.*")) // expect: true
+System.print(p1.match("f???.*")) // expect: true
+System.print(p1.match("*")) // expect: true

test/pathlib/mkdir.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var base = Path.new("/tmp/wren_pathlib_test_mkdir")
+if (base.exists()) base.rmtree()
+
+var nested = base / "a" / "b" / "c"
+nested.mkdir(true)
+System.print(nested.exists()) // expect: true
+System.print(nested.isDir()) // expect: true
+
+base.rmtree()
+System.print(base.exists()) // expect: false

test/pathlib/read_write.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var dir = Path.new("/tmp/wren_pathlib_test_rw")
+if (!dir.exists()) dir.mkdir()
+
+var f = dir / "test.txt"
+f.writeText("hello pathlib")
+System.print(f.readText()) // expect: hello pathlib
+System.print(f.exists()) // expect: true
+System.print(f.isFile()) // expect: true
+
+f.unlink()
+System.print(f.exists()) // expect: false
+
+dir.rmdir()

test/pathlib/relative_to.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var p1 = Path.new("/home/user/docs/file.txt")
+System.print(p1.relativeTo("/home/user")) // expect: docs/file.txt
+System.print(p1.relativeTo("/home")) // expect: user/docs/file.txt
+
+var p2 = Path.new("/home/user")
+System.print(p2.relativeTo("/home/user")) // expect: .

test/pathlib/rename.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var dir = Path.new("/tmp/wren_pathlib_test_rename")
+if (dir.exists()) dir.rmtree()
+dir.mkdir()
+
+var src = dir / "source.txt"
+src.writeText("content")
+System.print(src.exists()) // expect: true
+
+var dst = dir / "dest.txt"
+src.rename(dst)
+System.print(src.exists()) // expect: false
+System.print(dst.exists()) // expect: true
+System.print(dst.readText()) // expect: content
+
+dir.rmtree()

test/pathlib/walk.wren

@@ -0,0 +1,28 @@
+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var base = Path.new("/tmp/wren_pathlib_test_walk")
+if (base.exists()) base.rmtree()
+base.mkdir()
+
+(base / "file1.txt").writeText("a")
+var sub = base / "subdir"
+sub.mkdir()
+(sub / "file2.txt").writeText("b")
+
+var entries = base.walk()
+System.print(entries.count) // expect: 2
+
+var root1 = entries[0][0]
+var dirs1 = entries[0][1]
+var files1 = entries[0][2]
+System.print(dirs1) // expect: [subdir]
+System.print(files1) // expect: [file1.txt]
+
+var dirs2 = entries[1][1]
+var files2 = entries[1][2]
+System.print(dirs2) // expect: []
+System.print(files2) // expect: [file2.txt]
+
+base.rmtree()

test/pathlib/with_methods.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pathlib" for Path
+
+var p1 = Path.new("/home/user/file.txt")
+
+var p2 = p1.withName("other.md")
+System.print(p2) // expect: /home/user/other.md
+
+var p3 = p1.withStem("archive")
+System.print(p3) // expect: /home/user/archive.txt
+
+var p4 = p1.withSuffix(".bak")
+System.print(p4) // expect: /home/user/file.bak
+
+var p5 = Path.new("/data/file.tar.gz").withSuffix(".zip")
+System.print(p5) // expect: /data/file.tar.zip