Add comprehensive optimization consultation documents for xAgent

[Copilot]

Deep analysis of the xAgent codebase from first principles and best practices, producing a consult/ folder with 11 detailed markdown documents (~5,400 lines total) covering multi-angle optimization recommendations.

Key Issues Identified

• Critical bugs: Swarm.invoke() is a stub (pass), duplicate health_check function name causes route shadowing, global app = None breaks uvicorn xagent.interfaces.server:app
• Security gaps: Zero authentication on HTTP endpoints, no CORS, user_id injected into system prompt without sanitization, no rate limiting
• Performance: _register_mcp_servers called on every chat() even when cached; input_messages grows unboundedly across tool-call iterations; no tool execution timeouts; asyncio.create_task() results never awaited or checked
• Code quality: Chinese/English mixed comments, _sanitize_input_messages mutates caller's list in-place, streaming detection skips first two events (fragile against API changes)

Document Index

File	Focus
01_architecture_analysis.md	SRP violations, Swarm implementation blueprint, dependency grouping
02_code_quality.md	Side effects, type annotations, async resource management, deduplication
03_performance_optimization.md	Caching, connection pooling, concurrency model, input_messages accumulation
04_security.md	Auth middleware, CORS, prompt injection, input validation, session isolation
05_agent_capabilities.md	Planning (Plan-and-Execute), Reflexion self-correction, built-in tool library
06_memory_system.md	TTL expiry, pluggable embeddings, memory injection position, fast-path storage
07_workflow_orchestration.md	Error recovery strategies, Map-Reduce pattern, Router pattern
08_observability.md	Structured logging, Prometheus metrics, OpenTelemetry, deep health checks
09_testing_strategy.md	Test pyramid with runnable code for unit/integration/e2e + CI config
10_developer_experience.md	Dev deps, pre-commit, Makefile, friendlier errors, MkDocs API reference

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