feat(agent): implement agentic text-to-GQL system with multi-stage wo…

[SeasonPilot]

…rkflow

https://github.com/TuGraph-family/chat2graph/issues/231

Implement comprehensive agentic text-to-graph query language system with context awareness, multi-stage validation, and self-optimization capabilities.

Core Components:

• DAL Layer: Query session, history, pattern, and feedback management (8 files)
• Service Layer: Context tools and query context service (2 files)
• Operators: 6 specialized operators for query lifecycle management
  • Query intention analysis and validation
  • Complexity analysis with index recommendations
  • Path pattern recognition (multi-hop, temporal, spatial)
  • Comprehensive query validation (schema, semantic, performance, security)
  • Context enhancement with user preference learning
  • Query design with optimization strategies
• Resources: Multi-hop reasoning, query planning, and validation (3 files)
• Workflow: Complete agentic text2gql configuration with 7-stage pipeline
• Testing: Comprehensive test suite (22 files: unit + integration)
  • Unit tests for DAOs and services
  • Integration tests for operator collaboration and workflows

Key Features:

• Multi-stage workflow: understand → analyze → enhance → design → validate → execute
• Context-aware query optimization with historical pattern learning
• Real-time validation (schema, semantic, performance, security)
• Support for complex patterns: multi-hop, temporal, spatial queries
• Self-validating agentic workflow with feedback loops

Title

Type

• [x] feat: (new feature)
• [ ] fix: (bug fix)
• [ ] docs: (doc update)
• [ ] style: (update format)
• [ ] refactor: (refactor code)
• [ ] test: (test code)
• [ ] chore: (other updates)

Scope

• [x] app: (Application Layer)
  • [ ] web: (web front-end module)
  • [ ] server: (web server module)
  • [x] dal: (data access layer)
  • [ ] sdk: (sdk module)
• [ ] agent: (Agent Layer)
  • [x] reasoner: (reasoner module)
  • [ ] planner: (planner module)
  • [ ] workflow: (workflow module)
  • [ ] memory: (memory module)
  • [ ] knowledge: (knowledge module)
  • [ ] env: (env module)
  • [ ] toolkit: (toolkit module)
• [ ] system: (System Layer)
  • [x] plugin: (plugin module)
  • [ ] tracer: (tracer module)
  • [ ] resource: (resource module)
• [ ] none: (N/A)

Description

Issue: #

Checklist

• [x] I have prepared the pull request title according to the requirements.
• [x] I have successfully run all unit tests and integration tests.
• [x] I have followed the code style guidelines of this project.
• [x] I have already rebased the latest master branch.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.

[SeasonPilot]

#231