feat(hexai-action): add --infile/--outfile flags; docs and tests\n\n- Add flags to read from file and write to file\n- Refactor IO open into helper for testability\n- Add CLI integration-style test for IO\n- Update README and docs/usage.md with examples\n- Update docs/testing.md with instructions

1 files changed, 6 insertions, 0 deletions

diff --git a/README.md b/README.md
index 1486f4a..7a4e214 100644
--- a/README.md
+++ b/README.md
@@ -96,3 +96,9 @@ Run:
 
 - `cat input.go | ./hexai-action`
 - or `./hexai-action < input.go`
+- or with files: `./hexai-action --infile input.go --outfile output.go`
+
+Flags
+
+- `--infile`  Read input from the given file instead of stdin.
+- `--outfile` Write output to the given file instead of stdout (truncates/creates).