refactor(bgm): use doc-relative include in games and fixtures

The default include is now resolved relative to the package
declaration's directory, so the explicit root-relative patterns are
redundant. Drop them in favor of the default.

games/poker/poker.md

@@ -11,6 +11,7 @@ title: Poker
 designer: Public Domain
 players: 9
 language: en
+include: ['./**/*.yaml']
 ```
 
 ## Parts

packages/bgm/src/__fixtures__/vite-build/games/azul/azul.md

@@ -10,7 +10,7 @@ title: Azul
 designer: Michael Kiesling
 players: 4
 language: en
-include: ['**/azul/**/*.yaml']
+include: ['./**/*.yaml']
 ```
 
 ```yaml file=parts/tiles.yaml

packages/bgm/src/__fixtures__/vite-build/games/harbor/harbor.md

@@ -10,7 +10,7 @@ title: Harbor
 designer: Jane Doe
 players: 2
 language: en
-include: ['**/harbor/**/*.yaml']
+include: ['./**/*.yaml']
 ```
 
 ```yaml file=parts/tokens.yaml

packages/tabletop/src/__fixtures__/vite-build/games/harbor/harbor.md

@@ -7,7 +7,6 @@ real vite build.
 role: package
 id: harbor
 title: Harbor
-include: ['**/harbor/**/*.yaml']
 ```
 
 ```yaml file=parts/tokens.yaml