Add Type and More, and the file stream they are built on

Two applications that read a file too big for Data Memory: Type prints one,
More pages it. Both sit on fileStream.asm, which wraps osFileInfo and
osFileBlock into open-and-next so an application walks a file's blocks without
repeating the service calls.

The disk fixture is deliberately awkward: readable.txt crosses several blocks
and carries no zero byte to be mistaken for an end marker, and empty.txt says
that zero blocks is a valid file rather than an error.

These three files were written by ChatGPT, as their headers record.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW

Tests/input/cosmosMore.in

@@ -0,0 +1,6 @@
+load More.sbx
+run readable.txt
+qrun readable.txt
+ run readable.txt
+
+qexit

Tests/input/cosmosType.in

@@ -0,0 +1,6 @@
+load Type.sbx
+run readable.txt
+run empty.txt
+run missing.txt
+run
+exit