0.2.6-dev: 魂灵之影 only on a board of its field (#557, PR #558 by IceCodeNew adapted) — shadowTile requires Battle.onFieldBoard: a teammate's half counts, a boss field's hand / 临时整备区 rows and a solo boss field's empty half do not, no summon when nothing fits (the PR cut the bench rows by number, which left an empty half legal); the PR's test plus a solo / pair case; DESIGN §3, §31.10, SIM; golden: unchanged

docs/SIM.md

@@ -1617,3 +1617,7 @@ general hook guard. The queue is emptied in `finally`; it introduces no timer or
 - Healing skill activation includes elemental-only injury when the operator's heal profile can cure it. Pinecone S2 growth is deployment-local. Skadi S1 and Stead preserve redirect ancestry and take both shares from the pre-redirect hit, so the total damage is conserved.
 
 `champagneHold` includes the internal `isolated` ally-selection flag (§29.11): device-type champagne bombs are excluded from ordinary allied auras/inspiration in both creation paths. Other unhealable summons retain their own selection behavior.
+
+维什戴尔's `shadowTile` requires `Battle.onFieldBoard` before ranking summon candidates: a board of this field (a
+teammate's half), never a boss field's hand / 临时整备区 rows or an empty half (§31.10). `grid.inRect` alone also admits
+those bench rows. See [DESIGN §3](design/geometry-time.md#3-coordinates-fields-and-geometry) for the deployment boundary.