feat(design): add the Macaron (07) art direction and land the Signpost (06) package files

- 07 macaron, referenced from Meowdoku: cream worlds, a white tray with
  gutters, candy tokens with white arrows, two-column 关卡/待解 HUD, white
  elevated tool discs (macaron-only exception to the flat rule), full-screen
  dark result overlay, a brick ripple on board clear, an eased glide-out and
  dot-lattice dissolve on exit; Resource Han Rounded subset fonts (SIL OFL)
  in assets/fonts with the charset and regeneration note
- 06 signpost: the design.md, tokens and preview directory that earlier
  commits left untracked
- design docs, catalog, manifest, showcase and base spec updated to seven
  directions; the analysis and proposal live in docs/art-proposal-macaron.html
- the renderer, app, geometry and CSS sources for both directions were
  already carried by the level commits made from this working tree

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

design/README.md

@@ -1,6 +1,6 @@
 # HEX TRAILS · 设计系统入口
 
-这是给设计审核者和 Agent 共用的主游戏设计入口。当前有 5 套并列方案，每套 5 个主题，共 25 种组合。默认方案是 01「柔和原色」，最新候选是 05「轻线纸境」；可同时保留多套。
+这是给设计审核者和 Agent 共用的主游戏设计入口。当前有 7 套并列方案，每套 5 个主题，共 35 种组合。默认方案是 01「柔和原色」，最新候选是 07「马卡龙」；可同时保留多套。
 
 人看 [设计总览](index.html) 与 [可操作审核页](../design-showcase.html)。Agent 从本文、[共用接入约定](shared.md) 和本次指定方案的 design.md 开始；可直接读 [manifest.json](manifest.json) 发现全部文件。根目录 [AGENTS.md](../AGENTS.md) 与本目录 [AGENTS.md](AGENTS.md) 提供路由和维护要求。
 
@@ -23,6 +23,8 @@
 | 03 | toy | 积木轨道屋：塑胶积木 | [design.md](directions/toy/design.md) | [tokens.json](directions/toy/tokens.json) | [查看](directions/toy/index.html) |
 | 04 | animals | 动物弯弯镇：动物角色 | [design.md](directions/animals/design.md) | [tokens.json](directions/animals/tokens.json) | [查看](directions/animals/index.html) |
 | 05 | paper | 轻线纸境：细线纸面 | [design.md](directions/paper/design.md) | [tokens.json](directions/paper/tokens.json) | [查看](directions/paper/index.html) |
+| 06 | signpost | 路标：线路图棋盘与压痕控件 | [design.md](directions/signpost/design.md) | [tokens.json](directions/signpost/tokens.json) | [查看](directions/signpost/index.html) |
+| 07 | macaron | 马卡龙：白托盘糖砖棋盘，参考 Meowdoku | [design.md](directions/macaron/design.md) | [tokens.json](directions/macaron/tokens.json) | [查看](directions/macaron/index.html) |
 
 设计 ID、主题 ID 和关卡版本各自独立。每套都支持 `lagoon`（轻松）、`apricot`（进阶）、`lavender`（烧脑）、`rose`（挑战）、`midnight`（每周挑战）；显示名可以不同，ID 不变。各主题名称、色值与有序色板从 tokens.json 读取。