Deep Architectural Analysis and Documentation

[Sendipad]

This submission provides a deep architectural analysis of the FlexiRule repository, externalizing the system's mental model into versioned documentation.

Key outcomes include:

1. Rule Lifecycle Mapping: Detailed tracing of how logic transitions from Frappe's implicit hooks to FlexiRule's explicit, deterministic execution graphs.
2. Process V2 Analysis: Identification of the declarative runtime as the authoritative forward-compatible core, with V1 modules treated as legacy adapters.
3. Execution Engine Internals: Documentation of the Strategy pattern for Action Handlers, context isolation via overlays, and multi-layered cycle detection.
4. Expression System Evolution: Analysis of the shift toward a DSL-first model using the ValueResolver pattern to enhance security and performance.
5. Frontend-Backend Contract: Explanation of the contract-driven UI architecture that ensures visual design matches runtime reality.

No functional code was changed; all additions are in the form of architectural documentation and guidelines to ensure future development adheres to the system's core design constraints.

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PR created automatically by Jules for task 3808841373129475582 started by @Sendipad

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