The depguard / forbidigo rule blocks filepath.Abs in internal/ on the
grounds that it accesses the filesystem (Getwd) directly. Switch
RedactHomeDir + foldPrefix to operate on filepath.Clean strings; real
callers pass already-absolute paths (resolver builds yamlPath via
filepath.Join on the absolute config root), so the redaction outcome
is unchanged for production inputs. Relative inputs fall through to
the unchanged branch — filepath.Rel rejects the mixed-absoluteness
case with an error, which the foldPrefix helper already treats as
"not a hit".
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