Docs follow-ups: recipes page, GenUI sequence diagram, EventBus reference

[AimTune]

Three small additions to the docs/ tree to round out the reference set.

Tasks

docs/recipes.md

A "common recipes" page with copy-paste examples for the three frameworks people actually integrate Chativa with, plus the most-asked DirectLine setup question.

• Embed in React (with the useEffect-based registration of the connector + chatStore.setConnector call).
• Embed in Vue (Vue 3 / <script setup>).
• Embed in Wordpress (script tag in the theme + window.chativaSettings).
• DirectLine with a custom token endpoint — backend endpoint contract + how to wire tokenGeneratorUrl.

Linked from the README under "Documentation".

Sequence diagram for GenUI round-trip

docs/genui/streaming.md describes the chunk types and the round-trip from component event → connector → bot's response chunk. A mermaid sequence diagram makes the timing instantly readable.

• Mermaid sequenceDiagram with: User → GenUIComponent → ChatEngine → IConnector → bot backend → connector emits event chunk → component's listenEvent callback fires.

docs/events.md

packages/core/src/application/EventBus.ts defines a typed EventBusPayloadMap with 10 events. There is no central reference for them — devs have to read the source.

• One-page table: event name | payload type | when it fires.
• Cross-link from docs/extensions.md ("for read-only analytics, prefer EventBus") and docs/architecture.md.

Acceptance criteria

• All three pages link from README.md → Documentation table.
• All three pages render without errors on GitHub (mermaid diagrams included).

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Spun out of todos.md.