feedback7 R22-FIELDS: the path tie-break never wades into more 深水区 than the official route — on 战场#08(下半) the patrolling 铳 / 卢西恩 take the official upper road from (3,9) to (2,3) again (GitHub #375); golden: boss-boss_2-pair, coop2-ABYSS-10-boosted

GitHub #375 (FrogThai): 「水图boss会从下面这条路往蓝门走，实际应该从上路走」. The walking leaders of 战场#08(下半) 涨潮控制
(act2autochess_m04) are 铳 (level_act1autochess_h07_02 route 6; the Hidden Core 铳 on act1autochess_h08_02's patrol
routes) and 卢西恩 (act2autochess_h07_05 route 8): PATROL_MOVE (3,9) → (2,3) → (5,9). Measured (notes repro-375.mjs):
ours 「3,9 2,9 2,6 4,6 4,4 2,4 2,3」 — the lower road through the 深水区 (3,6) / (4,6) — against the official SPFA
「3,9 5,9 5,4 2,4 2,3」 along row 5 with one 深水区 (5,6); the mirrored (3,11) → (2,17) split the same way.
Cause: grid.js _buildField takes the blockable-ground preference pointer (user playtest #2) when its route crosses
strictly fewer non-blockable tiles; 深水区 is non-blockable itself (no deployment), so the lower road counted 2 against
the upper road's 3 (two floor tiles and one water tile) and won. Official pathfinding is the plain 4-neighbour SPFA
(research 08 §3.1). Now the preference pointer is taken only when its route also crosses no more 深水区 than the official
pointer's (a per-tile `deep` count beside `cost`, start excluded). Rule from the Grok triage (scratch-i1b/375.patch),
re-implemented with a precomputed Grid.deepWater mask (terrain 'deepsea': tile_deepsea and tile_deepwater).

Scope (notes dump-fields.mjs / check-official.mjs, every stage × normal / 联防 / boss rect × every walkable
destination): 48 fields change, only on the two water maps (act2 m04 boss field; the inactive act1 m05), 149 pointers,
every one back to the official pointer. The 21 accepted DEVIATIONS (战场#01 / #02 floor, #07, the inactive #05's 7
water-avoiding routes) are unchanged, as are all 154 audited gate routes and data/stages.json's groundPaths
(tools/build-data.mjs --offline into a scratch dir: every data file identical). Other boss-field preference routes of
m04 that cross fewer 深水区 than the official one stay.

Tests: test/sim/pathing-official.test.js — two new #375 tests (the four patrol legs equal the pure official waypoints;
in a real battle the 铳 climbs to row 5 and steps on the 深水区 (5,6) only), both failing on the parent;
test/sim/pathing-crosscheck.test.js — the independent reference port gets the same 深水区 rule (it flagged both the
patrol leg and a random-crate normal-field route of act2 m04 until then); test/sim/pathing-blockable.test.js — the WALK-leg
audit compares with the equal-length routes that cross no more 深水区 than ours (the 14 accepted arena exceptions
unchanged). Grid-related suites 777/777.

Golden:
- fields boss-boss_2-pair (铳 pair on act2autochess_m04, act1autochess_h07_02): the two 铳 patrol the upper roads;
  leader left 5311560 → 5301010, p1 damage up / p2 down, deaths 0 / 2 → 1 / 3; still 8 / 8 kills.
- matches coop2-ABYSS-10-boosted (act2 m04; Final Assault 卢西恩, Hidden Core 铳): still cleared, team LP 800 → 615. The
  bots' operators stand on the lower rows (the same tiles as before); with the leaders on the upper road the Final
  Assault lasts 335 game s instead of 247 and the Hidden Core 638 instead of 190, both past the 150 real-second mark:
  the overtime drain takes 17 + 168 LP (none before), no leak.

test/golden/matches.json

@@ -1404,7 +1404,7 @@
       "combat": "client",
       "boost": {"lp":400,"layers":300},
       "setup": {"stageId":"act2autochess_m04","bossId":"boss_5","hiddenBossId":"boss_9","factions":["FLY","ELEMENT","INVISIBLE"]},
-      "end": {"victory":true,"roundsPassed":15,"hiddenReached":true,"hiddenCleared":true,"reason":"victory","teamLp":800,"bossPoolLeft":0,"virtualMs":121650},
+      "end": {"victory":true,"roundsPassed":15,"hiddenReached":true,"hiddenCleared":true,"reason":"victory","teamLp":615,"bossPoolLeft":0,"virtualMs":121650},
       "rng": {"setup":25,"shop":590,"waves":0,"draft":61,"bots":22075,"meta":141},
       "errors": {"engine":0,"logged":0,"sim":0,"dispatcher":0},
       "rounds": [
@@ -1480,12 +1480,12 @@
           "victory": true,
           "roundsPassed": 15,
           "eliminatedRound": null,
-          "lp": 400,
+          "lp": 308,
           "bandId": "band_sarkazb",
-          "title": {"id":"comment_1","name":"卫戍之星","picId":"comment_icon_1","text":"对敌方领袖造成伤害最高（仅胜利时）"},
+          "title": {"id":"comment_3","name":"坚若磐石","picId":"comment_icon_3","text":"目标生命值损失最少"},
           "trophies": 8,
           "reward": 425,
-          "stats": {"activatedLayers":2267,"bossDamage":6992346,"dmgDealt":24545248,"gold":149,"itemsEquipped":23,"kills":290,"leaks":0,"lpLost":0,"merges":6,"perfectRounds":13,"refreshes":16},
+          "stats": {"activatedLayers":2267,"bossDamage":5899848,"dmgDealt":17549821,"gold":149,"itemsEquipped":23,"kills":301,"leaks":0,"lpLost":0,"merges":6,"perfectRounds":13,"refreshes":16},
           "lineup": ["3_16_b@12,8[3_01_e_a+1_01_e_b]","4_09_b@11,5","3_11_b@11,8[3_02_e_a+6_06_e_a]","1_02_b@10,4[1_02_e_a+4_02_e_a]","5_14_a@10,8[3_03_e_a+1_05_e_a]","6_20_a@9,6","3_20_a@9,8[3_07_e_a+3_08_e_a]","6_05_a@9,9[2_04_e_a+5_02_e_b]"],
           "bonds": ["arcaneShip 0/316","deputShip 1/312","egirShip 0/300","emptyShip 0/300","indomShip 0/300","investShip 0/300","kazimierzShip 0/302","kjeragShip 1/343","lateranoShip 0/300","maniShip 0/300","miraShip 0/300","preciShip 1/343","raidShip 0/300","sargonShip 0/300","siracusaShip 0/300","skillfulShip 0/319","soloShip 1/310","steadShip 1/341","suntShip 1/310","swiftShip 1/308","victoriaShip 0/300","visiShip 0/300","yanShip 0/300"]
         },
@@ -1494,12 +1494,12 @@
           "victory": true,
           "roundsPassed": 15,
           "eliminatedRound": null,
-          "lp": 400,
+          "lp": 307,
           "bandId": "band_doberm",
-          "title": {"id":"comment_2","name":"不朽盟约","picId":"comment_icon_2","text":"激活的盟约层数总和最高"},
+          "title": {"id":"comment_1","name":"卫戍之星","picId":"comment_icon_1","text":"对敌方领袖造成伤害最高（仅胜利时）"},
           "trophies": 8,
           "reward": 425,
-          "stats": {"activatedLayers":2301,"bossDamage":6900614,"dmgDealt":23861530,"gold":165,"itemsEquipped":31,"kills":276,"leaks":0,"lpLost":0,"merges":5,"perfectRounds":13,"refreshes":38},
+          "stats": {"activatedLayers":2301,"bossDamage":7980752,"dmgDealt":27393341,"gold":165,"itemsEquipped":31,"kills":276,"leaks":0,"lpLost":0,"merges":5,"perfectRounds":13,"refreshes":38},
           "lineup": ["2_10_a@11,5[2_03_e_b+3_09_e_a]","5_03_a@11,8[1_02_e_a+5_02_e_a]","1_06_a@10,3[1_05_e_a+3_02_e_a]","3_16_a@10,4[3_03_e_b+4_04_e_b]","5_06_a@10,8[3_09_e_b+3_09_e_b]","4_21_b@9,6[4_06_e_a+3_10_e_b]","5_02_a@9,8[4_09_e_a+3_06_e_b]","1_17_b@9,9[3_08_e_a+1_01_e_a]"],
           "bonds": ["arcaneShip 1/327","deputShip 1/318","egirShip 0/300","emptyShip 0/300","indomShip 1/308","investShip 0/300","kazimierzShip 0/300","kjeragShip 0/300","lateranoShip 0/300","maniShip 0/300","miraShip 0/300","preciShip 1/404","raidShip 0/300","sargonShip 0/300","siracusaShip 0/300","skillfulShip 1/308","soloShip 0/310","steadShip 0/323","suntShip 1/304","swiftShip 0/300","victoriaShip 1/332","visiShip 0/300","yanShip 0/305"]
         }