fix(vfs): paths with `./` prefix fail to resolve in glob and file operations

[chaliy]

Summary

VFS file operations fail when paths use the ./ prefix (e.g., ./tag_hello.html). The error is: io error: parent directory not found.

Reproduction

cd /tmp/blogtest
# This works:
ls tag_hello.html
# This fails:
ls ./tag_hello.html
# Error: parent directory not found

Also affects glob patterns:

ls ./*.html        # may fail
ls -t ./*.html     # may fail

Context

Discovered while running bashblog via bashkit CLI. Bashblog uses ./ prefixed paths throughout:

• for i in ./*.html
• ls -t ./*.html
• rm ./"$prefix_tags"*.html

The rebuild_tags function creates files like ./tag_hello.html which fail to write.

Expected behavior

./foo should resolve identically to foo relative to the current working directory.