internal/stream: reject trailing data (no EOF) after end of stream

testdata/testkit/stream_bad_tag

@@ -0,0 +1,10 @@
+expect: payload failure
+payload: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+file key: 59454c4c4f57205355424d4152494e45
+identity: AGE-SECRET-KEY-1XMWWC06LY3EE5RYTXM9MFLAZ2U56JJJ36S0MYPDRWSVLUL66MV4QX3S7F6
+
+age-encryption.org/v1
+-> X25519 TEiF0ypqr+bpvcqXNyCVJpL7OuwPdVwPL7KQEbFDOCc
+EmECAEcKN+n/Vs9SbWiV+Hu0r+E8R77DdWYyd83nw7U
+--- Vn+54jqiiUCE+WZcEVY3f1sqHjlu/z1LCQ/T7Xm7qI0
+îÏbÇΑ´3'NhÔòùL·L[þ÷¾ªRÈð¼™,ƒ1ûF

testdata/testkit/stream_missing_tag

@@ -0,0 +1,10 @@
+expect: payload failure
+payload: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+file key: 59454c4c4f57205355424d4152494e45
+identity: AGE-SECRET-KEY-1XMWWC06LY3EE5RYTXM9MFLAZ2U56JJJ36S0MYPDRWSVLUL66MV4QX3S7F6
+
+age-encryption.org/v1
+-> X25519 TEiF0ypqr+bpvcqXNyCVJpL7OuwPdVwPL7KQEbFDOCc
+EmECAEcKN+n/Vs9SbWiV+Hu0r+E8R77DdWYyd83nw7U
+--- Vn+54jqiiUCE+WZcEVY3f1sqHjlu/z1LCQ/T7Xm7qI0
+îÏbÇΑ´3'NhÔòùL·L[

testdata/testkit/stream_no_chunks

@@ -0,0 +1,10 @@
+expect: payload failure
+payload: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+file key: 59454c4c4f57205355424d4152494e45
+identity: AGE-SECRET-KEY-1XMWWC06LY3EE5RYTXM9MFLAZ2U56JJJ36S0MYPDRWSVLUL66MV4QX3S7F6
+
+age-encryption.org/v1
+-> X25519 TEiF0ypqr+bpvcqXNyCVJpL7OuwPdVwPL7KQEbFDOCc
+EmECAEcKN+n/Vs9SbWiV+Hu0r+E8R77DdWYyd83nw7U
+--- Vn+54jqiiUCE+WZcEVY3f1sqHjlu/z1LCQ/T7Xm7qI0
+îÏbÇΑ´3'NhÔòùL

testdata/testkit/stream_no_final

@@ -0,0 +1,11 @@
+expect: payload failure
+payload: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+file key: 59454c4c4f57205355424d4152494e45
+identity: AGE-SECRET-KEY-1XMWWC06LY3EE5RYTXM9MFLAZ2U56JJJ36S0MYPDRWSVLUL66MV4QX3S7F6
+
+age-encryption.org/v1
+-> X25519 TEiF0ypqr+bpvcqXNyCVJpL7OuwPdVwPL7KQEbFDOCc
+EmECAEcKN+n/Vs9SbWiV+Hu0r+E8R77DdWYyd83nw7U
+--- Vn+54jqiiUCE+WZcEVY3f1sqHjlu/z1LCQ/T7Xm7qI0
+îÏbÇΑ´3'NhÔòùL�íS;àû¬|º9¥¥È
+w�^Ú

testdata/testkit/stream_no_nonce

@@ -0,0 +1,8 @@
+expect: header failure
+file key: 59454c4c4f57205355424d4152494e45
+identity: AGE-SECRET-KEY-1XMWWC06LY3EE5RYTXM9MFLAZ2U56JJJ36S0MYPDRWSVLUL66MV4QX3S7F6
+
+age-encryption.org/v1
+-> X25519 TEiF0ypqr+bpvcqXNyCVJpL7OuwPdVwPL7KQEbFDOCc
+EmECAEcKN+n/Vs9SbWiV+Hu0r+E8R77DdWYyd83nw7U
+--- Vn+54jqiiUCE+WZcEVY3f1sqHjlu/z1LCQ/T7Xm7qI0

testdata/testkit/stream_short_chunk

@@ -0,0 +1,10 @@
+expect: payload failure
+payload: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+file key: 59454c4c4f57205355424d4152494e45
+identity: AGE-SECRET-KEY-1XMWWC06LY3EE5RYTXM9MFLAZ2U56JJJ36S0MYPDRWSVLUL66MV4QX3S7F6
+
+age-encryption.org/v1
+-> X25519 TEiF0ypqr+bpvcqXNyCVJpL7OuwPdVwPL7KQEbFDOCc
+EmECAEcKN+n/Vs9SbWiV+Hu0r+E8R77DdWYyd83nw7U
+--- Vn+54jqiiUCE+WZcEVY3f1sqHjlu/z1LCQ/T7Xm7qI0
+îÏbÇΑ´3'NhÔòùL[æè.½Ó#Èw

testdata/testkit/stream_short_nonce

@@ -0,0 +1,9 @@
+expect: header failure
+file key: 59454c4c4f57205355424d4152494e45
+identity: AGE-SECRET-KEY-1XMWWC06LY3EE5RYTXM9MFLAZ2U56JJJ36S0MYPDRWSVLUL66MV4QX3S7F6
+
+age-encryption.org/v1
+-> X25519 TEiF0ypqr+bpvcqXNyCVJpL7OuwPdVwPL7KQEbFDOCc
+EmECAEcKN+n/Vs9SbWiV+Hu0r+E8R77DdWYyd83nw7U
+--- Vn+54jqiiUCE+WZcEVY3f1sqHjlu/z1LCQ/T7Xm7qI0
+îÏbÇΑ´3'NhÔ