Add implementation roadmap and milestone workplans

workplans/ADAPTIVE-WP-0004-boundary-engine-and-explainable-validation.md

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+---
+id: ADAPTIVE-WP-0004
+type: workplan
+title: "Boundary engine and explainable validation"
+domain: financials
+repo: adaptive-pricing
+status: backlog
+owner: codex
+topic_slug: helix-forge
+created: "2026-07-02"
+updated: "2026-07-02"
+state_hub_workstream_id: "3ab759a2-97b6-4cf0-8c14-80dae637c23a"
+---
+
+# Boundary engine and explainable validation
+
+Turn strategic pricing constraints from `INTENT.md` into an explicit validation
+engine with inspectable outcomes.
+
+## Formalize Constraint Model
+
+```task
+id: ADAPTIVE-WP-0004-T01
+status: todo
+priority: high
+state_hub_task_id: "180ea896-4e89-4256-b1ba-0d72e4d49dcd"
+```
+
+Define the internal representation for hard and soft constraints, including
+minimum margin, cost floor, payment fees, commitment requirements, segment
+eligibility, and approval thresholds.
+
+## Implement Validation Engine
+
+```task
+id: ADAPTIVE-WP-0004-T02
+status: todo
+priority: high
+state_hub_task_id: "16c96dc5-45fc-4cca-9f71-d3b8d797f28f"
+```
+
+Implement evaluation logic that accepts a pricing configuration and returns
+pass/fail results, violated constraints, and structured reasons.
+
+## Model Commitment-Backed Discounts
+
+```task
+id: ADAPTIVE-WP-0004-T03
+status: todo
+priority: high
+state_hub_task_id: "adaa7751-b1b9-4d9e-a708-4caaf6a4801d"
+```
+
+Encode rules for discounts, concessions, and improved unit economics so they
+require enforceable or economically meaningful commitments instead of optimistic
+usage assumptions.
+
+## Add Scenario And Abuse Tests
+
+```task
+id: ADAPTIVE-WP-0004-T04
+status: todo
+priority: medium
+state_hub_task_id: "96a1f2d4-518f-4e4f-8227-43bac08ff615"
+```
+
+Add scenario tests that cover valid configurations, invalid discounting,
+rejected commitment trades, and edge cases such as zero-usage, high-fee, or
+unprofitable configurations.
+
+## Exit Criteria
+
+```task
+id: ADAPTIVE-WP-0004-T05
+status: todo
+priority: medium
+state_hub_task_id: "0a771125-cc2b-4339-b210-ac834562516f"
+```
+
+Exit when pricing configurations can be validated against explicit constraints
+with machine-readable and human-readable explanations.
+
+Dependencies: `ADAPTIVE-WP-0003`.
+