Update docs and changelog

[xprilion]

This pull request focuses on updating documentation and clarifying the architecture, configuration, and usage of OpenMLR. The changes modernize the README, improve the agent harness documentation, update API references, and correct the project version. These updates enhance clarity for both new and existing users, and ensure the documentation reflects recent feature and mode changes.

Documentation and Usage Updates:

• README.md: Major rewrite for clarity—streamlined introduction, updated feature list, improved quick start and configuration sections, added testing instructions, and simplified Makefile usage. The onboarding flow and per-conversation parallelism are now highlighted. [1] [2] [3]
• site/docs/agent-harness.md: Heavily revised to clarify the agent harness architecture, agent loop, mode enforcement, context management, doom loop detection, DB-persisted writing, Redis interrupt relay, sub-agent streaming, and per-conversation isolation. Outdated extension and debugging sections were removed. [1] [2]
• site/docs/api.md: Updated API documentation to match current endpoints and features, clarified mode names (Plan/Execute), documented Redis interrupt relay, and added frontend route descriptions. Version in health endpoint updated. [1] [2] [3]
• site/docs/.vitepress/config.ts: Navigation updated for new mode names (Plan/Execute), and a Changelog link was added. [1] [2]

Project Metadata:

• backend/pyproject.toml: Corrected project version from 2.0.0 to 0.2.0 to match release.

[github-actions]

Qodana for Python

154 new problems were found

Inspection name	Severity	Problems
Invalid type hints definitions and usages	🔴 Failure	18
Invalid type hints definitions and usages	🔶 Warning	20
Unused imports	🔶 Warning	11
Unused local symbols	◽️ Notice	45
Class has no init method	◽️ Notice	39
Shadowing names from outer scopes	◽️ Notice	8
Accessing a protected member of a class or a module	◽️ Notice	6
Method is not declared static	◽️ Notice	3
PEP 8 naming convention violation	◽️ Notice	3
Inconsistent return statements	◽️ Notice	1

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