docs(changelog): correct test-count claim (716 → 672 baseline)

QA caught a number error in the prior CHANGELOG commit (b516057):
"Test suite: 716 → 789 (+73 tests)" was wrong — the 716 baseline was
invented. Actual count at the parent of the session's first commit
(c9488d9~1) was 672 tests collected. Real session delta is +117.

Verified via:
  git checkout c9488d9~1
  pytest tests/unit/ --collect-only -q  →  672 tests collected

Corrected the prose to "672 → 789 (+117 tests this session, spanning
the G1/G2/G3 coverage batches, the BLOCKER fix's TestRevertCsvHandler,
and the final G5 push)".

The wl_presence claim (40% → 100%) that QA also flagged is correct
as written — `pytest --cov=wl_presence` reports `168 0 100%` and the
58 tests in tests/unit/test_presence.py all pass. The QA "module
never imported" finding was incorrect and is being disputed via
re-dispatch.

No code or test changes. Doc-drift OK.

Author: RelativisticJet

CHANGELOG.md

@@ -124,7 +124,9 @@ Modules still below 80% — deferred to v1.1 backlog or covered by the
 integration suite: `wl_csv` (60%, security boundary), `wl_limits`
 (67%), `wl_trash` (65%).
 
-Test suite: 716 → 789 (+73 tests).
+Test suite: 672 → 789 (+117 tests this session, spanning the G1/G2/G3
+coverage batches, the BLOCKER fix's `TestRevertCsvHandler`, and the
+final G5 push).
 
 `bin/wl_handler.py` was NOT modified during this work — it is
 FORBIDDEN as a unit-test or mutation target per the hardening rules.