Create CONTRACTS.md

CONTRACTS.md

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+<h1 align="center"># AISA Cross-Layer Contracts</h1>
+
+AISA relies on explicit cross-layer contracts to ensure predictable, governable, and reproducible agentic system behavior.
+These contracts define how constraints and signals propagate across layers.
+
+---
+
+## Contract Overview
+
+| Contract | Purpose | Key Artifacts |
+|---------|---------|---------------|
+| **Policy** | Enforce governance and safety constraints | Tool permissions, approval rules, safety policies, escalation rules |
+| **Telemetry** | Enable auditability and traceability | Run IDs, traces, tool logs, policy markers, budget signals |
+| **Versioning** | Ensure reproducibility and controlled change | Models, prompts, tools, workflows, memory and evaluation artifacts |
+| **Budget** | Control cost, latency, and risk | Token limits, time limits, tool-call limits, cost ceilings |
+
+---
+
+## Contract Descriptions
+
+**Policy** :Defines what actions are allowed, restricted, or require approval, and how safety and escalation rules are enforced at runtime.
+
+**Telemetry**  :Specifies the minimum signals required to trace, audit, and reproduce agent behavior across executions.
+
+**Versioning**  :Ensures that agent behavior changes are attributable to explicit,versioned artifacts rather than implicit system drift.
+
+**Budget**  :Bounds resource usage to prevent runaway behavior and enable cost- and risk-aware operation.