docs: add 2.0.0 CHANGELOG

[fucangfy]

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[gemini-code-assist]

Summary of Changes

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This pull request marks a significant milestone by introducing the 2.0.0 version of SCQL, featuring a complete architectural overhaul. The core system has transitioned from a Broker-based design to a more integrated Compiler + Engine model, streamlining interactions and removing several legacy components. This change aims to modernize the system's foundation and simplify its usage for developers.

Highlights

• SCQL 2.0 OpenCore Architecture: Introduced a new SCQL 2.0 OpenCore architecture based on a native Compiler + Engine model, replacing the previous SCDB/SCQLBroker/CCL architecture.
• Architectural Redesign (Breaking Change): The system architecture was redesigned from a Broker-based model to direct Compiler + Engine integration, requiring users to call the compiler API and send execution plans to engines. This is a breaking change.
• Component Removal: Removed SCQLBroker, SCDB, and CCL components, along with their related documentation, legacy deployment guides, API references, and architecture documentation.
• Documentation and Examples: Added an opencore-demo example and quickstart documentation for the new architecture, and updated existing documentation to reflect the OpenCore changes.

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Changelog

• CHANGELOG.md
  • Added the changelog entry for version 2.0.0, detailing major architectural changes, new features, and removed components.

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[gemini-code-assist]

Code Review

This pull request adds a changelog entry for version 2.0.0. The entry is detailed and reflects the major architectural changes introduced. My feedback includes a suggestion to improve the structure of the changelog file to better align with the 'Keep a Changelog' standard by removing a now-empty section header.

[Copilot]

Pull request overview

Adds a new 2.0.0 entry to the project changelog to document the SCQL 2.0 “OpenCore” architecture release and associated breaking changes.

Changes:

• Added a new 2.0.0 release section dated 2026-03-16.
• Documented major additions/changes/removals/fixes for the 2.0.0 release (new CompilerService API, tracing flags, new operators/adaptors, removal of SCDB/Broker/CCL, etc.).

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[tyrone-yu]

LGTM