feedback5 CB5: the boss round's prep shows both players of a pair together — the partner's pieces on the other half, as the battle places them — and frames the pair's two avatars in the official green (community report of 2026-10-06, item 51)

The own half was already the official one (the right-hand player on the right half with the
right_boss_*_camera_param camera, its layout mirrored col c -> 20 - c with RIGHT <-> LEFT, so its operators
face the leader as before: research 09 §1.2, DESIGN §15); the partner's half stood empty and nothing framed
the pair.
Server: in a boss round's prep m.private.bossMate { playerId, side, units } = the partner's board as UnitInfo
on its half (Match.bossMateView, finalAssault.js bossFieldPlacement); markPrivate marks the partner's
m.private with the mover's, so it follows live; a scout of either player (Match.prepFieldMeta) carries both
halves (`mate`), and its signature covers the partner's board.
Client: render/app.js syncMates draws the partner's units read-only ('m:<uid>' views: never picked, dragged
or swept with the own pieces) and the whole boss field is lit; the team panel frames the pair's avatars
(gameLogic teamFrameIds: the players still in by seat, two by two, as prepCamera — the boss field in the
fight) from the round start through the Final Assault / Hidden Core, with the official ui/battle
bg_team_border tinted the autochess green (#4ed8af; a plain ring without the local art); none for a lone
player, an eliminated player, a spectator seat, or 联防.
Overlap with PR #191 (same-field frames, issue #190; not merged): it published m.public bossPairing and
framed the partner alone in gold, 联防 included, plus a banner naming the partner; here the pairing is read
as the prep camera already does, both avatars get the official green frame, boss rounds only.
[ASSUMED] the partner's bench is not shown; one frame per avatar.

Golden unchanged. Tests: test/match/feedback5-boss-pair-prep.test.js (new, 4), the item 55 test now checks
the scouted player's own pieces (the partner's stand on the other half); SP_E2E
test/ui/feedback5-boss-pair.e2e.test.js (new, 2: both halves and the frames in prep and fight; item 55's
eliminated guest on the boss field with the leader). Docs: design/client.md §10 / §15, design/network.md,
PLAYING.md.

test/match/feedback5-boss-prep-scout.test.js

@@ -43,7 +43,7 @@ test('a scout of a boss round\'s prep is the boss field: the player\'s half (mir
   assert.deepEqual([u.y, u.x, u.dir, u.facing], [want.row, want.col, 'LEFT', -1], 'mirrored onto the right half, still facing the leader');
   const bench = meta.units.find((x) => x.y === 0);
   assert.ok(bench && bench.x === 20 - 2, `the hand row on the half's bench row (boss row 0, mirrored): ${JSON.stringify(bench)}`);
-  for (const x of meta.units) assert.ok(x.y >= 0 && x.y <= 5 && x.x >= 10 && x.x <= 20, `on the right half: ${x.y},${x.x}`);
+  for (const x of meta.units.filter((x) => x.ownerId === 'p_1')) assert.ok(x.y >= 0 && x.y <= 5 && x.x >= 10 && x.x <= 20, `on the right half: ${x.y},${x.x}`);
   // the leader stands at its spawn tile: the client's leaderStand finds it in the scout's nextEnemies
   const stand = leaderStand(meta.nextEnemies, () => null, (x, y) => [[y, x]]);
   assert.ok(stand && stand.entry.boss && stand.row >= 0 && stand.row <= 5, `the leader with its spawn tile: ${JSON.stringify(stand?.entry)}`);
@@ -55,7 +55,9 @@ test('a scout of a boss round\'s prep is the boss field: the player\'s half (mir
   assert.deepEqual(m.handle('p_3', { t: 'g.watch', fieldId: 'n:p_0' }), { ok: true });
   const left = h.lastTo('p_3', 'm.field');
   assert.deepEqual([left.kind, left.side], ['boss', 'L']);
-  for (const x of left.units) assert.ok(x.x <= 10, 'the left half');
+  // its own pieces on the left half (since item 51 the partner p_1's board stands on the right half beside them)
+  for (const x of left.units.filter((x) => x.ownerId === 'p_0')) assert.ok(x.x <= 10, 'the left half');
+  assert.ok(left.units.some((x) => x.ownerId === 'p_1' && x.uid === onBoard.uid && x.x === want.col), 'p_1\'s piece on the right half');
   m.dispose();
 });