docs: add Phase 3 plan - priority-based conflict resolution

Author: jovanSAPFIONEER

CHANGELOG.md

@@ -5,6 +5,14 @@ All notable changes to Network-AI will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased] -- Phase 3: Priority & Preemption
+
+### Planned
+- **Priority-Based Conflict Resolution** -- `'priority-wins'` strategy for `LockedBlackboard` commit step; higher-priority agents preempt lower-priority pending writes on same-key conflicts (0=low, 3=critical)
+- **`ConflictResolutionStrategy` option** -- Choose between `'first-commit-wins'` (default, current behavior) and `'priority-wins'` (new)
+- **Priority-aware `validate()` / `commit()`** -- Wire `HandoffMessage.metadata.priority` into the atomic commit pipeline
+- **MCP Networking** -- Cross-machine agent communication (see [references/mcp-roadmap.md](references/mcp-roadmap.md))
+
 ## [3.1.0] - 2026-02-16
 
 ### Added -- Phase 2: Trust