feat(education): complete student core loop delivery

tools/education-student-harness/fixtures/README.md

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+# Fixture schemas
+
+Fixtures are synthetic documentation examples, not default application data and not copies of prototype data. They model the stable fields the harness reads.
+
+## `context.json`
+
+```json
+{
+  "userId": 1001,
+  "tenantId": 2001,
+  "tenantName": "Local Pilot School",
+  "displayName": "Local Pilot School"
+}
+```
+
+## `question-collection.json`
+
+```json
+{
+  "id": "collection-local-001",
+  "name": "Synthetic practice collection",
+  "collectionType": "QUESTION_BANK",
+  "questionCount": 3,
+  "status": "PUBLISHED"
+}
+```
+
+## `practice-session.json`
+
+```json
+{
+  "id": 9001,
+  "clientSessionId": "local-session-001",
+  "status": "ACTIVE",
+  "questionCount": 3,
+  "sessionVersion": 1,
+  "questions": [
+    {
+      "sequence": 1,
+      "questionId": "question-local-001",
+      "contentVersion": "v1",
+      "stem": "Synthetic question content",
+      "type": "choice",
+      "options": [{ "label": "A", "content": "Synthetic option" }],
+      "selectedAnswer": null
+    }
+  ]
+}
+```
+
+## `page.json`
+
+```json
+{
+  "list": [],
+  "total": 0
+}
+```
+
+Do not add `correctAnswer`, `explanation`, access tokens, phone numbers, real names, provider identifiers, or licensed question text to pre-submission fixtures. Post-submission report examples may include answer/explanation fields only when explicitly needed to document the permitted post-submit response boundary.

tools/education-student-harness/fixtures/context.json

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+{
+  "userId": 1001,
+  "tenantId": 2001,
+  "tenantName": "Local Pilot School",
+  "displayName": "Local Pilot School"
+}

tools/education-student-harness/fixtures/page.json

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+{
+  "list": [],
+  "total": 0
+}

tools/education-student-harness/fixtures/practice-session.json

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+{
+  "id": 9001,
+  "clientSessionId": "local-session-001",
+  "status": "ACTIVE",
+  "questionCount": 3,
+  "sessionVersion": 1,
+  "questions": [
+    {
+      "sequence": 1,
+      "questionId": "question-local-001",
+      "contentVersion": "v1",
+      "stem": "Synthetic question content",
+      "type": "choice",
+      "options": [{ "label": "A", "content": "Synthetic option" }],
+      "selectedAnswer": null
+    }
+  ]
+}

tools/education-student-harness/fixtures/question-collection.json

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+{
+  "id": "collection-local-001",
+  "name": "Synthetic practice collection",
+  "collectionType": "QUESTION_BANK",
+  "questionCount": 3,
+  "status": "PUBLISHED"
+}