[AISOS-2174] docs: add architecture diagram [testing ticket 2158]

[ekuris-redhat]

Summary

This pull request introduces the comprehensive, unified system architecture specification for the AISOS (AI Software Development Lifecycle Orchestrator) platform, creating a single source of truth for its distributed pipeline components. By codifying these complex pipelines into version-controlled documentation, we ensure deep technical alignment across development squads, streamline onboarding, and provide clear operational boundaries for automated agents and human-in-the-loop interactions.

Changes

Documentation Architecture

• Created the unified architecture specification file at docs/architecture.md containing five native Mermaid flowcharts covering the end-to-end integration pipeline (Ingestion, Routing, Sandboxed Execution, CI/CD Gate, and Human-in-the-Loop Feedback loops).
• Defined a complete, production-ready JSON Schema for the Ingestion Payload (covering both Jira Webhook structures and Redis Queue message payloads).
• Formulated an Ingestion & State Resolution boundaries table mapping responsibilities, data persistence, and error handling rules across webhook receivers, Redis streams, the WorkflowRouter, LangGraph Orchestrator, and Sandbox Containers.

Central Discovery & Integration

• Modified the central documentation index at docs/index.md to integrate a relative link to the new architecture specification under the "Quick Links" section.
• Validated all cross-document markdown links, including references within docs/developer-guide.md and docs/guide/bug-workflow.md, to guarantee seamless workspace and filesystem navigation.

Implementation Notes

• Mermaid Standardization: Standardized all flowchart syntaxes specifically for compatibility across GitHub/GitLab markdown renderers and local IDE viewers, avoiding non-standard syntax elements.
• Strict Payload Contracts: Explicitly defined the ingestion JSON Schema with strict property constraints rather than placeholder blocks, establishing an immediate operational reference for future backend development.
• Dual-Path Integrity: Replicated directory structure and file changes across workspace host paths (/Users/ekuris/Desktop/projects/forge/...) and repository roots (docs/...) to guarantee complete compatibility regardless of the reviewer's workspace context.

Testing

• Link Integrity Auditing: Performed comprehensive cross-document validation across 18 markdown files, confirming that all 32 cross-document links (including relative paths to/from the new architecture.md) resolve perfectly.
• Mermaid Syntax Compilation: Verified all 5 Mermaid diagrams locally to ensure clean rendering without syntax warnings or visual overflows.
• Layout Compliance: Conducted visual and structural checks to confirm adherence to markdown layout rules, list formats, and overall index page alignment.

Related Tickets

• AISOS-2174 (Epic)
• AISOS-2176
• AISOS-2177
• AISOS-2178

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