fix(forge-game): set tokenSpawningAbility on Endure-created tokens

[delebedev]

Summary

EndureEffect creates its Spirit token via TokenInfo.getProtoType(...) directly but forgets to call result.setTokenSpawningAbility(sa) afterward. Every other token-creating effect in forge-game does this:

Class	Location
TokenEffectBase.createTokenTable	line 46
TokenEffectBase.makeTokenTableInternal	line 59
AmassEffect.resolve	line 69
CopyPermanentEffect.resolve	line 308
ReplaceTokenEffect	lines 82, 136

Card.tokenSpawningAbility is the canonical back-reference from a token to the SA that produced it. Engine resolution doesn't depend on it (Endure works fine in vanilla Forge today) — but any consumer that traces a token back to its source ability (replay tooling, custom GUIs, simulation harnesses) sees a null source for Endure tokens.

Change

One line, mirroring AmassEffect line 69:

```java
result.setTokenSpawningAbility(sa);
```

placed right after the token prototype is built and PT set.

Test plan

• No behavioural change for vanilla Forge — Endure resolves identically (counters / token branches both fire as before).
• `Card.tokenSpawningAbility` is now non-null on Endure-spawned tokens, consistent with Amass / generic token-creating effects.
• No new test added — the fix is one missing line in a pattern that the rest of the codebase already follows; covered by existing token-effect smoke checks.

PATCHES.md

Added a new "Engine fixes" section noting this as a fork-local patch.