chore: prepare v0.1.0 OSS release

- Add MIT LICENSE file
- Update version to 0.1.0
- Add mol-version-bump molecule for release workflow
- Terse README for OSS release

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

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

internal/beads/builtin_molecules_test.go

@@ -5,8 +5,8 @@ import "testing"
 func TestBuiltinMolecules(t *testing.T) {
 	molecules := BuiltinMolecules()
 
-	if len(molecules) != 6 {
-		t.Errorf("expected 6 built-in molecules, got %d", len(molecules))
+	if len(molecules) != 7 {
+		t.Errorf("expected 7 built-in molecules, got %d", len(molecules))
 	}
 
 	// Verify each molecule can be parsed and validated