feedback6 R21A: a 突袭 member may land on a teammate's half when both halves of the field are taken — the two-helper 联防 field and the Final Assault / Hidden Core pair field (the owner's decision of 2026-10-07): Battle.onFieldBoard (onOwnBoard of any player of the battle) read by raidTile only; a lone 联防 helper's empty half, a solo boss field's other half and the hand / 临时整备区 rows stay closed, every other landing rule kept, 乌尔比安's S3 【移动】 keeps onOwnBoard; golden: 8 moved, each parting from the parent at a member's first landing on its teammate's half (checked tick by tick with the parent instrumented) — fields boss-boss_2 / 3 / 4 / 5 / 6-pair and hidden-boss_8 / 10-pair (the right player's 缄默德克萨斯 / 伊内丝 / 仇白 / 耀骑士临光 on the left player's half, 1–7 landings per battle, the first 0.3–39.8 s in), matches coop4-ABYSS-7 (round 6's two-helper 联防: ai_2's 斯卡蒂 on ai_1's half at 52 s; only ai_1 / ai_2 dmgDealt move, 8263 between them); unite-2 unchanged (its two landings stay on their own half)

Tests: test/sim/feedback5-raid-own-board.test.js — the pair field (the right player's member onto the left telin's board tile (2,3), the left player's onto the mirrored right (2,17), the hand rows closed) and the two-helper 联防 (each helper onto the other's half; 乌尔比安 beside a teammate stays on his own) fail on the parent; the solo boss field's hand rows and the lone helper unchanged.
Docs: docs/history/0.2.1.md (new, §26; §26.1 cites the owner's decision and PRTS 卫戍协议/帮助 §联防阶段), the DESIGN index row and versions line, a pointer from §25.18.1, docs/SIM.md (onFieldBoard; onOwnBoard now 乌尔比安's only).

docs/history/0.2.0.md

@@ -1379,6 +1379,10 @@ briefing types' share of the waves).
 
 #### 25.18.1 「…新约能天使在开了突袭之后蹦到了下方…临时放置溢出的干员和道具的那一栏高台」, 「单人联防时突袭也可以跑到对面的场地上」 (items 40, 16.3): 突袭 lands only on its player's own board — `sim/battle/players.js onOwnBoard`, `content/bonds/addon/battle.js raidTile`
 
+- **Changed in 0.2.1** (§26.1, the owner's decision of 2026-10-07): where both halves of the field are taken — the
+  two-helper 联防 field and a Final Assault / Hidden Core pair field — a member may land on its teammate's half too
+  (`Battle.onFieldBoard`); the hand / 临时整备区 rows, a lone helper's empty half and a solo boss field's other half stay
+  closed. This replaces the own-half rule of **Now** below on those two fields.
 - **Seen**: in a solo leader round a ranged 突袭 member (新约能天使 with the 转职球 and the 突袭手雷) jumped onto the
   boss field's 临时整备区 row; in a 联防 with one helper a member jumped onto the right half of the map.
 - **Cause**: `raidTile` took any tile of the battle rect its position may stand on (grid.canStand). BOSS_RECT holds rows