docs(scanner): update README with known issues and add binary ignores to .scannerignore

Author: chalmerlowe

scripts/version_scanner/.scannerignore

@@ -14,3 +14,9 @@ changelog.md
 goldens
 # Ignore pandoc references in repositories.bzl
 repositories.bzl
+
+# Ignore binary media files
+*.jpg
+*.png
+*.gif
+*.ico

scripts/version_scanner/README.md

@@ -29,3 +29,6 @@ The scanner uses a YAML configuration file (`regex_config.yaml`) to define rules
 ## Ignoring Directories
 
 You can create a `.scannerignore` file in the directory you are scanning (usually the repo root) to list directories to skip, one per line.
+
+## Known Issues & Future Investigations
+- **Binary Ignores in `.scannerignore`**: Recursive wildcard ignores (e.g., `*.jpg`) currently do not effectively ignore deeply nested binary files. The scanner logic should be investigated to support robust globbing or full-path suffix matching.