Remove old channel-based implementation files

- Delete obsolete readfile.go, readfilelcontext.go, tailfile.go, catfile.go
- Clean up deprecated comments in readcommand.go
- Add *.query to .gitignore for temporary test files
- DTail now operates purely in channelless mode
- All tests passing after cleanup

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

1 files changed, 0 insertions, 20 deletions

diff --git a/internal/io/fs/catfile.go b/internal/io/fs/catfile.go
deleted file mode 100644
index e4676f3..0000000
--- a/internal/io/fs/catfile.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package fs
-
-// CatFile is for reading a whole file.
-type CatFile struct {
-	readFile
-}
-
-// NewCatFile returns a new file catter.
-func NewCatFile(filePath string, globID string, serverMessages chan<- string) CatFile {
-	return CatFile{
-		readFile: readFile{
-			filePath:       filePath,
-			globID:         globID,
-			serverMessages: serverMessages,
-			retry:          false,
-			canSkipLines:   false,
-			seekEOF:        false,
-		},
-	}
-}