feat: allow prompt template for @supermemory/tools package (#655)01-06-feat_allow_prompt_template_for_supermemory_tools_package

## Add customizable prompt templates for memory injection

**Changes:**

- Add `promptTemplate` option to `withSupermemory()` for full control over injected memory format (XML, custom branding, etc.)
- New `MemoryPromptData` interface with `userMemories` and `generalSearchMemories` fields
- Exclude `system` messages from persistence to avoid storing injected prompts
- Add JSDoc comments to all public interfaces for better DevEx

**Usage:**

```typescript
const customPrompt = (data: MemoryPromptData) => `
<user_memories>
${data.userMemories}
${data.generalSearchMemories}
</user_memories>
`.trim()

const model = withSupermemory(openai("gpt-4"), "user-123", {
  promptTemplate: customPrompt,
})
```

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