context loading, path resolution, form state, dynamic rules, and provider-neutral assessment runner/cache boundary

examples/runtime/workplan-dynamic.contract.md

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+# Dynamic Workplan Contract
+
+```yaml contract
+id: dynamic-workplan-contract-v1
+document:
+  type: workplan
+fields:
+  id:
+    type: string
+    required: true
+  status:
+    type: string
+    required: true
+    enum: [proposed, active, done, deferred]
+  owner:
+    type: string
+    source: context.workplan.owner
+sections:
+  - id: purpose
+    title: Purpose
+    presence: required
+    level: 2
+  - id: tasks
+    title: Tasks
+    presence: required
+    level: 2
+  - id: decision-point
+    title: Decision Point
+    presence: optional
+    level: 2
+rules:
+  - id: require-decision-point-when-done
+    if:
+      path: fields.status.value
+      equals: done
+    then:
+      sections:
+        decision-point:
+          presence: required
+  - id: owner-needed-for-active-work
+    if:
+      path: fields.status.value
+      equals: active
+    then:
+      required: [owner]
+```