feat: enhance mock data with evidence pointers and MOCK-NCT IDs

- Add EvidencePointer and TrialEvidencePointer to all criteria for
end-to-end traceability (PRD requirement)
- Use MOCK-NCT prefix on trial IDs to clearly distinguish synthetic data
- Add SourceDocument references for clinic letter, pathology, and labs
- Structure criteria into named variables for readability

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/services/mock_data.py

@@ -2,6 +2,10 @@
 
 Provides realistic sample PatientProfile, TrialCandidates, and EligibilityLedgers
 so the UI is fully demonstrable without real MedGemma/Gemini/MCP calls.
+
+NOTE: NCT IDs use a MOCK-NCT prefix to clearly indicate synthetic data.
+Real trial names are used for demo realism, but the IDs are not real
+ClinicalTrials.gov identifiers.
 """
 
 from __future__ import annotations
@@ -13,28 +17,72 @@ from trialpath.models import (
     Demographics,
     Diagnosis,
     EligibilityLedger,
+    EvidencePointer,
     GapItem,
     OverallAssessment,
     PatientProfile,
     PerformanceStatus,
+    SourceDocument,
     Treatment,
     TrialCandidate,
+    TrialEvidencePointer,
     UnknownField,
 )
 
+# ---------------------------------------------------------------------------
+# Source documents (synthetic)
+# ---------------------------------------------------------------------------
+_CLINIC_LETTER = SourceDocument(
+    doc_id="clinic_letter_2026-01.pdf",
+    type="clinic_letter",
+    meta={"author": "Dr. Mueller", "date": "2026-01-15"},
+)
+_PATHOLOGY_REPORT = SourceDocument(
+    doc_id="pathology_2025-11.pdf",
+    type="pathology",
+    meta={"lab": "Charite Berlin", "date": "2025-11-20"},
+)
+_LAB_RESULTS = SourceDocument(
+    doc_id="labs_2026-01.pdf",
+    type="lab",
+    meta={"date": "2026-01-28"},
+)
+
+# ---------------------------------------------------------------------------
+# Patient profile
+# ---------------------------------------------------------------------------
 MOCK_PATIENT_PROFILE = PatientProfile(
     patient_id="MOCK-P001",
+    source_docs=[_CLINIC_LETTER, _PATHOLOGY_REPORT, _LAB_RESULTS],
     demographics=Demographics(age=62, sex="Female"),
     diagnosis=Diagnosis(
         primary_condition="Non-Small Cell Lung Cancer",
         histology="adenocarcinoma",
         stage="IIIB",
     ),
-    performance_status=PerformanceStatus(scale="ECOG", value=1),
+    performance_status=PerformanceStatus(
+        scale="ECOG",
+        value=1,
+        evidence=[EvidencePointer(doc_id="clinic_letter_2026-01.pdf", page=1)],
+    ),
     biomarkers=[
-        Biomarker(name="EGFR", result="Exon 19 deletion"),
-        Biomarker(name="ALK", result="Negative"),
-        Biomarker(name="PD-L1", result="45%"),
+        Biomarker(
+            name="EGFR",
+            result="Exon 19 deletion",
+            evidence=[
+                EvidencePointer(doc_id="pathology_2025-11.pdf", page=2, span_id="egfr_exon19")
+            ],
+        ),
+        Biomarker(
+            name="ALK",
+            result="Negative",
+            evidence=[EvidencePointer(doc_id="pathology_2025-11.pdf", page=2, span_id="alk_neg")],
+        ),
+        Biomarker(
+            name="PD-L1",
+            result="45%",
+            evidence=[EvidencePointer(doc_id="pathology_2025-11.pdf", page=3, span_id="pdl1_45")],
+        ),
     ],
     treatments=[
         Treatment(drug_name="Carboplatin", line=1),
@@ -46,9 +94,12 @@ MOCK_PATIENT_PROFILE = PatientProfile(
     ],
 )
 
+# ---------------------------------------------------------------------------
+# Trial candidates
+# ---------------------------------------------------------------------------
 MOCK_TRIAL_CANDIDATES = [
     TrialCandidate(
-        nct_id="NCT04000001",
+        nct_id="MOCK-NCT-KEYNOTE999",
         title="KEYNOTE-999: Pembrolizumab + Chemo for NSCLC",
         conditions=["NSCLC"],
         phase="Phase 3",
@@ -56,7 +107,7 @@ MOCK_TRIAL_CANDIDATES = [
         fingerprint_text="Pembrolizumab combination therapy advanced NSCLC",
     ),
     TrialCandidate(
-        nct_id="NCT04000002",
+        nct_id="MOCK-NCT-FLAURA2",
         title="FLAURA-2: Osimertinib + Chemo in EGFR-mutated NSCLC",
         conditions=["NSCLC", "EGFR mutation"],
         phase="Phase 3",
@@ -64,7 +115,7 @@ MOCK_TRIAL_CANDIDATES = [
         fingerprint_text="Osimertinib first-line EGFR mutated advanced NSCLC",
     ),
     TrialCandidate(
-        nct_id="NCT04000003",
+        nct_id="MOCK-NCT-CM817",
         title="CheckMate-817: Nivolumab + Ipilimumab in Advanced NSCLC",
         conditions=["NSCLC"],
         phase="Phase 3",
@@ -73,37 +124,132 @@ MOCK_TRIAL_CANDIDATES = [
     ),
 ]
 
-MOCK_ELIGIBILITY_LEDGERS = [
-    EligibilityLedger(
-        patient_id="MOCK-P001",
-        nct_id="NCT04000001",
-        overall_assessment=OverallAssessment.UNCERTAIN,
-        criteria=[
-            CriterionAssessment(
-                criterion_id="inc_1",
-                type="inclusion",
-                text="Confirmed NSCLC diagnosis",
-                decision=CriterionDecision.MET,
+# ---------------------------------------------------------------------------
+# Eligibility ledgers -- evidence-linked per PRD requirement
+# ---------------------------------------------------------------------------
+
+# --- KEYNOTE-999: UNCERTAIN (PD-L1 not met at 45% vs >=50%, brain mets unknown) ---
+_KEYNOTE_CRITERIA = [
+    CriterionAssessment(
+        criterion_id="inc_1",
+        type="inclusion",
+        text="Confirmed NSCLC diagnosis",
+        decision=CriterionDecision.MET,
+        patient_evidence=[
+            EvidencePointer(doc_id="pathology_2025-11.pdf", page=1, span_id="dx_nsclc"),
+        ],
+        trial_evidence=[
+            TrialEvidencePointer(field="eligibility_text.inclusion", offset_start=0, offset_end=42),
+        ],
+    ),
+    CriterionAssessment(
+        criterion_id="inc_2",
+        type="inclusion",
+        text="ECOG performance status 0-1",
+        decision=CriterionDecision.MET,
+        patient_evidence=[
+            EvidencePointer(doc_id="clinic_letter_2026-01.pdf", page=1, span_id="ecog_1"),
+        ],
+        trial_evidence=[
+            TrialEvidencePointer(
+                field="eligibility_text.inclusion", offset_start=43, offset_end=89
             ),
-            CriterionAssessment(
-                criterion_id="inc_2",
-                type="inclusion",
-                text="ECOG performance status 0-1",
-                decision=CriterionDecision.MET,
+        ],
+    ),
+    CriterionAssessment(
+        criterion_id="inc_3",
+        type="inclusion",
+        text="PD-L1 TPS >= 50%",
+        decision=CriterionDecision.NOT_MET,
+        patient_evidence=[
+            EvidencePointer(doc_id="pathology_2025-11.pdf", page=3, span_id="pdl1_45"),
+        ],
+        trial_evidence=[
+            TrialEvidencePointer(
+                field="eligibility_text.inclusion", offset_start=90, offset_end=130
             ),
-            CriterionAssessment(
-                criterion_id="inc_3",
-                type="inclusion",
-                text="PD-L1 TPS >= 50%",
-                decision=CriterionDecision.NOT_MET,
+        ],
+    ),
+    CriterionAssessment(
+        criterion_id="exc_1",
+        type="exclusion",
+        text="No active brain metastases",
+        decision=CriterionDecision.UNKNOWN,
+    ),
+]
+
+# --- FLAURA-2: LIKELY_ELIGIBLE (EGFR mutation confirmed, stage/ECOG met) ---
+_FLAURA_CRITERIA = [
+    CriterionAssessment(
+        criterion_id="inc_1",
+        type="inclusion",
+        text="Confirmed NSCLC with EGFR mutation",
+        decision=CriterionDecision.MET,
+        patient_evidence=[
+            EvidencePointer(doc_id="pathology_2025-11.pdf", page=2, span_id="egfr_exon19"),
+        ],
+        trial_evidence=[
+            TrialEvidencePointer(field="eligibility_text.inclusion", offset_start=0, offset_end=54),
+        ],
+    ),
+    CriterionAssessment(
+        criterion_id="inc_2",
+        type="inclusion",
+        text="ECOG 0-1",
+        decision=CriterionDecision.MET,
+        patient_evidence=[
+            EvidencePointer(doc_id="clinic_letter_2026-01.pdf", page=1, span_id="ecog_1"),
+        ],
+        trial_evidence=[
+            TrialEvidencePointer(
+                field="eligibility_text.inclusion", offset_start=55, offset_end=78
             ),
-            CriterionAssessment(
-                criterion_id="exc_1",
-                type="exclusion",
-                text="No active brain metastases",
-                decision=CriterionDecision.UNKNOWN,
+        ],
+    ),
+    CriterionAssessment(
+        criterion_id="inc_3",
+        type="inclusion",
+        text="Locally advanced or metastatic",
+        decision=CriterionDecision.MET,
+        patient_evidence=[
+            EvidencePointer(doc_id="clinic_letter_2026-01.pdf", page=1, span_id="stage_iiib"),
+        ],
+        trial_evidence=[
+            TrialEvidencePointer(
+                field="eligibility_text.inclusion", offset_start=79, offset_end=125
             ),
         ],
+    ),
+]
+
+# --- CheckMate-817: LIKELY_INELIGIBLE (requires Stage IV, patient is IIIB) ---
+_CM817_CRITERIA = [
+    CriterionAssessment(
+        criterion_id="inc_1",
+        type="inclusion",
+        text="Stage IV NSCLC",
+        decision=CriterionDecision.NOT_MET,
+        patient_evidence=[
+            EvidencePointer(doc_id="clinic_letter_2026-01.pdf", page=1, span_id="stage_iiib"),
+        ],
+        trial_evidence=[
+            TrialEvidencePointer(field="eligibility_text.inclusion", offset_start=0, offset_end=35),
+        ],
+    ),
+    CriterionAssessment(
+        criterion_id="inc_2",
+        type="inclusion",
+        text="No prior immunotherapy",
+        decision=CriterionDecision.UNKNOWN,
+    ),
+]
+
+MOCK_ELIGIBILITY_LEDGERS = [
+    EligibilityLedger(
+        patient_id="MOCK-P001",
+        nct_id="MOCK-NCT-KEYNOTE999",
+        overall_assessment=OverallAssessment.UNCERTAIN,
+        criteria=_KEYNOTE_CRITERIA,
         gaps=[
             GapItem(
                 description="Brain MRI results needed",
@@ -114,48 +260,16 @@ MOCK_ELIGIBILITY_LEDGERS = [
     ),
     EligibilityLedger(
         patient_id="MOCK-P001",
-        nct_id="NCT04000002",
+        nct_id="MOCK-NCT-FLAURA2",
         overall_assessment=OverallAssessment.LIKELY_ELIGIBLE,
-        criteria=[
-            CriterionAssessment(
-                criterion_id="inc_1",
-                type="inclusion",
-                text="Confirmed NSCLC with EGFR mutation",
-                decision=CriterionDecision.MET,
-            ),
-            CriterionAssessment(
-                criterion_id="inc_2",
-                type="inclusion",
-                text="ECOG 0-1",
-                decision=CriterionDecision.MET,
-            ),
-            CriterionAssessment(
-                criterion_id="inc_3",
-                type="inclusion",
-                text="Locally advanced or metastatic",
-                decision=CriterionDecision.MET,
-            ),
-        ],
+        criteria=_FLAURA_CRITERIA,
         gaps=[],
     ),
     EligibilityLedger(
         patient_id="MOCK-P001",
-        nct_id="NCT04000003",
+        nct_id="MOCK-NCT-CM817",
         overall_assessment=OverallAssessment.LIKELY_INELIGIBLE,
-        criteria=[
-            CriterionAssessment(
-                criterion_id="inc_1",
-                type="inclusion",
-                text="Stage IV NSCLC",
-                decision=CriterionDecision.NOT_MET,
-            ),
-            CriterionAssessment(
-                criterion_id="inc_2",
-                type="inclusion",
-                text="No prior immunotherapy",
-                decision=CriterionDecision.UNKNOWN,
-            ),
-        ],
+        criteria=_CM817_CRITERIA,
         gaps=[
             GapItem(
                 description="KRAS mutation status unknown",