Initial commit: DeathWatch, an Elden Ring death counter for OBS

Reads the game's process memory read-only (AOB signature scanning,
re-resolved every tick — never a cached pointer) and serves a live
death counter as a browser-source overlay plus a status panel.

Supports co-op: each player runs the program locally, one acts as
hub. The peer link is authenticated (HMAC challenge/response, no
token on the wire, constant-time compare) but not yet encrypted —
see CLAUDE.md's TODO section for the planned TLS+pinning split.

Zero external dependencies — including a hand-rolled WebSocket
implementation — so the whole thing ships as one .exe.

names_test.go

@@ -0,0 +1,54 @@
+package main
+
+import "testing"
+
+func TestLooksLikeName(t *testing.T) {
+	cases := []struct {
+		name string
+		ok   bool
+	}{
+		// Latin: the usual case.
+		{"Vaike", true},
+		{"Jean-Paul", true},
+		{"O'Brien", true},
+		{"Tarnished 2", true},
+
+		// Cyrillic.
+		{"Иван", true},
+		{"Мария Петровна", true},
+
+		// Hangul.
+		{"지우", true},
+		{"김민준", true},
+
+		// CJK: Han, Hiragana, and Katakana count as a single family
+		// because Japanese mixes them in one name.
+		{"田中", true},    // Han alone (also valid in Chinese)
+		{"たろう", true},   // Hiragana alone
+		{"タロウ", true},   // Katakana alone
+		{"田中たかし", true}, // Han + Hiragana, typical Japanese name
+
+		// Cases that MUST keep failing (regression, see CLAUDE.md):
+		// Greek + Han mixed, the garbage a 64-bit pointer decodes into
+		// when read as UTF-16.
+		{"ᾘ䱷翶", false},
+
+		// Mixing two ACCEPTED families is still mixing: not a valid
+		// name in any real language.
+		{"Аnna", false}, // Cyrillic А + Latin nna
+
+		// The usual rules: length, leading punctuation, digits-only.
+		{"", false},
+		{"A", false},
+		{"WayTooLongOfANameToBeRealHonestly", false},
+		{"-Starts", false},
+		{"123", false},
+		{"Ok 123", true},
+	}
+
+	for _, c := range cases {
+		if got := looksLikeName(c.name); got != c.ok {
+			t.Errorf("looksLikeName(%q) = %v, wanted %v", c.name, got, c.ok)
+		}
+	}
+}