Fix read/write tool output formatting

- Remove code fences (```) from read output - show raw content
- Show first 10 lines instead of 5 for read
- Only show line count for write if > 10 lines
- Remove indentation from read output
- Cleaner, more minimal tool output display

packages/test.txt

@@ -0,0 +1,20 @@
+Line 1: The quick brown fox jumps over the lazy dog
+Line 2: Testing the TUI renderer with multiple lines
+Line 3: Each line contains some different text
+Line 4: This is line number four
+Line 5: Halfway through the first ten lines
+Line 6: More content for testing purposes
+Line 7: Seven is a lucky number
+Line 8: Eight lines down, twelve to go
+Line 9: Almost at line ten
+Line 10: Double digits now
+Line 11: Starting the second half
+Line 12: A dozen lines complete
+Line 13: Unlucky for some, lucky for others
+Line 14: Fortnight means fourteen nights
+Line 15: Three quarters of the way there
+Line 16: Sweet sixteen
+Line 17: Just a few more lines left
+Line 18: Penultimate line coming up
+Line 19: This is the second to last line
+Line 20: The final line of this test file