fix(review): quick FT path enforces 3-state exclusivity + twin propagation; changelog + twin caveat

set_false_trigger now clears reviewed_real when flagging false_trigger=True
(mirrors update_event_review's exclusivity), and the quick
PATCH /db/events/{id}/false_trigger endpoint now calls
propagate_review_to_twins after the flag write, matching the sidecar PATCH
path's try/except-with-log.warning pattern. Previously the quick path could
leave both flags set and never touched twins.

Also corrects the v0.25.0 CHANGELOG bullet (exclusivity was not actually
enforced on the quick path until this commit) and adds a caveat comment on
find_twins about rare clamped/saturated-PVS false-positive twin matches.

CHANGELOG.md

@@ -24,13 +24,16 @@ window).
   `SeismoDb()` construction, no manual migration). `query_events` /
   `get_event` (and thus `/db/events`) return it automatically (`SELECT *`).
 - **Mutual exclusivity with `false_trigger`** — setting `reviewed_real=1`
-  clears `false_trigger`, and vice versa, both via `set_false_trigger` /
-  the sidecar review PATCH path.
+  clears `false_trigger`, and vice versa, enforced on both review paths:
+  the sidecar review PATCH (`update_event_review`) and the quick
+  `PATCH /db/events/{id}/false_trigger` endpoint (`set_false_trigger`).
 - **`find_twins`** — matches an event's histogram/waveform twins by serial +
   identical peak-vector-sum + a timestamp window.
 - **`propagate_review_to_twins`** — copies an event's `false_trigger`/
-  `reviewed_real` state onto its twins, wired into the
-  `PATCH /db/events/{id}/sidecar` review path so flagging one flags both.
+  `reviewed_real` state onto its twins, wired into both the
+  `PATCH /db/events/{id}/sidecar` review path and the quick
+  `PATCH /db/events/{id}/false_trigger` path, so flagging one flags both
+  regardless of which endpoint made the change.
 
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