Forward-looking design for the codex-side PII redactor utility flagged
in Phase A Step E (Q5) and explicitly deferred from Phase B. Captures
the per-game redactor shape (RedactorInterface plus
ProjectZomboidRedactor under src/Util/), the rationale for not using
a single generic regex utility (PII detection is context-sensitive),
the replacement conventions that match the synthetic fixture
placeholders, the regex anchor shapes, and the open questions for v1
vs v2.
Status: deferred. Not implemented in this commit. The spec exists so
iblogs's upload-time PII story has a referenced design to point at,
and so a future implementation pass has a clear contract to start
from.