minor style tweaks

atproto/identity/directory.go

···
 var ErrKeyNotDeclared = errors.New("DID document did not declare a relevant public key")
 
 // Handle was invalid, in a situation where a valid handle is required.
-var ErrInvalidHandle = errors.New("Invalid Handle")
+var ErrInvalidHandle = errors.New("invalid handle")
 
 var DefaultPLCURL = "https://plc.directory"
 

atproto/repo/mst/mst_test.go

···
 
 	mapKeys := make([]string, len(inMap))
 	i := 0
-	for k, _ := range inMap {
+	for k := range inMap {
 		mapKeys[i] = k
 		i++
 	}

atproto/repo/operation_test.go

···
 	assert.NoError(err)
 	assert.Error(CheckOp(tree, op))
 
-	op, err = ApplyOp(tree, "color/pink", &c3)
+	_, err = ApplyOp(tree, "color/pink", &c3)
 	assert.NoError(err)
 	op, err = ApplyOp(tree, "color/pink", &c2)
+	assert.NoError(err)
 	assert.NoError(CheckOp(tree, op))
 	assert.True(op.IsUpdate())
 	err = InvertOp(tree, op)
···
 	}
 	mapKeys := make([]string, len(startMap))
 	i := 0
-	for k, _ := range startMap {
+	for k := range startMap {
 		mapKeys[i] = k
 		i++
 	}

atproto/syntax/tid.go

···
 
 // Constructs a new TID from a UNIX timestamp (in milliseconds) and clock ID value.
 func NewTID(unixMicros int64, clockId uint) TID {
-	var v uint64 = (uint64(unixMicros&0x1F_FFFF_FFFF_FFFF) << 10) | uint64(clockId&0x3FF)
+	v := (uint64(unixMicros&0x1F_FFFF_FFFF_FFFF) << 10) | uint64(clockId&0x3FF)
 	return NewTIDFromInteger(v)
 }