vfs: handle current-position sentinel in memory files#64163
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Treat -1 as the current file position in MemoryFileHandle read and write operations. This matches the value passed by fs.readSync() after normalizing a null position. Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com> Assisted-by: openai:gpt-5.5
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Fixes: #64162
This updates VFS memory file handles to treat
-1as the current-positionsentinel for read and write operations.
fs.readSync()normalizes anullposition to-1before dispatching to VFS,but
MemoryFileHandlepreviously treated-1as an explicit offset. That mademounted in-memory files fail instead of reading from and advancing the current
file position.
Assisted-by: openai:gpt-5.5