feat(games): add the generic d6 oracle game package

Serves as the reference implementation of the game package contract:
rules, spark tables, character backgrounds, and an example command.

games/generic/game.md

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+# Generic d6 Oracle
+
+System-agnostic solo play. No stats are required: the fiction and the d6 carry
+the game. Use this as a base for a setting, or as the reference for how a game
+package is structured.
+
+## Resolution
+
+Ask the oracle one yes/no question at a time:
+
+```
+journal oracle "Is the bridge still standing?" --campaign <name>
+```
+
+| d6 | Result | Meaning |
+|----|--------|---------|
+| 6 | **Yes, and…** | It works, with a fortunate extra. |
+| 5 | **Yes** | It works, plainly. |
+| 4 | **Yes, but…** | It works, at a cost. |
+| 3 | **No, but…** | It fails, with an opening. |
+| 2 | **No** | It fails, plainly. |
+| 1 | **No, and…** | It fails, and something gets worse. |
+
+On `and`/`but` results, pass `--complicate` to fold in a twist.
+
+## The PC
+
+Keep a minimal sheet: name, background, inventory, and any lasting conditions.
+`stats` and `tracks` may stay empty. If a stat grows out of play, record its
+shape in the campaign's `house-rules.md` so it stays consistent.
+
+## Character creation
+
+1. Roll a background: `journal background --campaign <name>`
+2. Give the PC a name and one relationship to the world.
+3. Write a starting situation into `campaign.md`.
+
+## Pacing
+
+End a scene when the situation changes or the player's intent resolves. Append
+scenes; never rewrite them.
+
+## Content
+
+- `tables/sparks.csv` — general content prompts.
+- `tables/complication-themes.csv` — twists on `and`/`but` results.
+- `characters/backgrounds.csv` — rollable starting backgrounds.