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Add dedicated unit tests for four REPL components that lacked
test coverage:
- SignalHandler (signal_test.go): 5 tests covering constructor,
Stop() without Start, callback execution, goroutine semantics,
and single-shot signal handling behavior
- TTYChecker (tty_test.go): 5 tests covering EnsureTTY error in
non-TTY context, error message content, IsTTY return value,
IsTTY/EnsureTTY consistency, and idempotent behavior
- HistoryManager (history_test.go): 11 tests covering constructor,
Path() with default and custom baseDir, Save/Load roundtrip,
maxEntries truncation, non-existent file, empty file/slice,
special characters, and file overwrite behavior. Added
WithBaseDir() method to enable testing with temp directories.
- AutoCompleteAdapter (completer_adapter_test.go): 5 tests covering
Do() with empty/whitespace input, exact/partial/no matches,
case-insensitive matching, multi-word completion, cursor position,
common prefix calculation, and command order preservation
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