spec(tz-aware-datetime): correct speculative l4d2host carve-out

The previous version implied l4d2host has tz patterns to defer. An
inventory grep showed it has no datetime usage at all (no `from datetime`
import anywhere in the tree). Replace the bullet with the verified
finding.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/superpowers/specs/2026-05-16-tz-aware-datetime-design.md

@@ -238,8 +238,9 @@ datetimes all along, just losing the tzinfo on the wire.
 - Postgres portability. `UtcDateTime` would adapt with `impl =
   DateTime(timezone=True)` if the dialect supports it, but switching
   dialects is its own project.
-- Cleanup of any tz patterns in `l4d2host` (the dedicated-server side of
-  the repo). This work touches only `l4d2web`.
+- `l4d2host` (the dedicated-server CLI side of the repo) has no datetime
+  usage — no `from datetime` import anywhere in the tree, verified by
+  grep. The scope boundary is documentary; no follow-up work exists.
 - Static enforcement (mypy plugin, ruff rule) for "naive datetime crossing
   into a `UtcDateTime` column." The runtime `TypeError` is the gate; a
   static check would be a nice-to-have.