docs: fix outdated task type names in documentation and Javadoc

[ginccc]

Summary

The Javadoc on ILifecycleTask.java lists "Standard Task Types" using two outdated names. Two doc files also reference the old HttpCallsTask class name.

What to change

File	Line	Current	Correct
src/main/java/ai/labs/eddi/engine/lifecycle/ILifecycleTask.java	57	**HTTP Calls**	**API Calls**
src/main/java/ai/labs/eddi/engine/lifecycle/ILifecycleTask.java	58	**LangChain**	**LLM**
docs/agent-father-deep-dive.md	474	HttpCallsTask	ApiCallsTask
docs/conversation-memory.md	566	HttpCallsTask	ApiCallsTask

Context: HttpCallsTask was renamed to ApiCallsTask and LangchainTask was renamed to LlmTask during the v6 refactoring. The config file is still named langchain.json for backward compatibility, but the task class and conceptual name are now "LLM."

Out of scope

docs/changelog.md contains historical references — those are correct as-is.

Acceptance criteria

• All four lines are updated
• No other occurrences of HttpCallsTask in docs/ (excluding changelog.md)
• ./mvnw compile passes