test: production ingest E2E test suite with enhanced logging (#55)

## Summary
Production testing of ingest + embedding pipeline with api-gw integration.

## Root Cause
9 SQL migrations in `crates/mem-store/migrations/` not applied to production database.

Missing tables:
- `memory_entity`
- `memory_edge`
- `memory_edge_temporal`
- Vector embeddings tables
- And 15+ more schema objects

Evidence from logs:
```
WARN: Failed to save entity Docker:
      error returned from database: relation "memory_entity" does not exist
```

## Deliverables
- `test_prod_ingest_real.sh` - Full E2E test against K8s + api-gw
- `apply_migrations.sh` - Manual schema migration (backup)
- `collect_prod_logs.sh` - Pod log collection before/after
- `run_production_test.sh` - Test orchestrator
- `tests/integration_ingest_with_gw.rs` - Integration test
- `tests/unit_ingest_logging.rs` - Unit tests for extraction
- Enhanced logging in `ingest_worker.rs` - Per-record event tracking

## Next Steps
1. Trigger "DB Migration" workflow in Forgejo Actions
2. This applies all 9 migrations from `crates/mem-store/migrations/`
3. Pod restart (automatic)
4. Re-run E2E test - should pass completely

**ETA:** ~15 minutes (3-5 min migrations + 2 min restart + verification)

## How to Test Locally
```bash
./test_prod_ingest_real.sh --verbose
```

Requires:
- kubectl access to poimen namespace
- Port-forwarding to memory-service

---------

Co-authored-by: rock <[email protected]>
Reviewed-on: #55
Co-authored-by: poimen <[email protected]>

k8s/tekton/integration-test-task.yaml

@@ -0,0 +1,144 @@
+---
+# Tekton Task: Integration Tests for Poimen Memory Service
+#
+# Executes:
+#   1. Database migrations
+#   2. Integration test suites (cargo test)
+#   3. Reports results
+#
+# Parameters:
+#   - image: Docker image with SHA to test
+#
+# Results:
+#   - summary: Test summary (pass/fail + count)
+
+apiVersion: tekton.dev/v1
+kind: Task
+metadata:
+  name: poimen-integration-test
+  namespace: poimen
+spec:
+  params:
+  - name: image
+    type: string
+    description: "Docker image SHA to test (e.g., forgejo.riotpiao.com/riotpiao-poimen/poimen-memory:abc123)"
+
+  results:
+  - name: summary
+    description: "Test summary: PASS or FAIL + test count"
+
+  steps:
+  # Step 1: Apply database migrations
+  - name: migrate
+    image: $(params.image)
+    env:
+    - name: DB_HOST
+      value: "memory-db-rw.poimen.svc.cluster.local"
+    - name: DB_PORT
+      value: "5432"
+    - name: DB_NAME
+      value: "memory"
+    - name: DB_USER
+      value: "app"
+    - name: DB_PASSWORD
+      valueFrom:
+        secretKeyRef:
+          name: memory-db-app
+          key: password
+    
+    script: |
+      #!/bin/bash
+      set -e
+      
+      echo "=========================================="
+      echo "Step 1: Database Migrations"
+      echo "=========================================="
+      echo ""
+      
+      # Run migrations
+      /app/migrations/run_migrations.sh
+      
+      echo ""
+      echo "✓ Migrations complete"
+
+  # Step 2: Run integration tests
+  - name: test
+    image: $(params.image)
+    env:
+    - name: DATABASE_URL
+      value: "postgresql://[email protected]:5432/memory"
+    - name: RUST_LOG
+      value: "info,mem_cli=debug,mem_ingest=debug,mem_store=debug"
+    - name: MEM_AUTH_MODE
+      value: "none"
+    - name: SQLX_OFFLINE
+      value: "true"
+    - name: PGPASSWORD
+      valueFrom:
+        secretKeyRef:
+          name: memory-db-app
+          key: password
+    
+    script: |
+      #!/bin/bash
+      set -e
+      
+      echo "=========================================="
+      echo "Step 2: Integration Tests"
+      echo "=========================================="
+      echo ""
+      
+      TEST_SUITES=(
+        "it_phase3_phase4"
+        "it_unified_query_4_6"
+        "it_temporal_filtering_4_2_fixed"
+      )
+      
+      PASSED=0
+      FAILED=0
+      
+      for suite in "${TEST_SUITES[@]}"; do
+        echo "Running: $suite"
+        if cargo test --test "$suite" --lib 2>&1 | tail -50; then
+          ((PASSED++))
+          echo "✓ $suite passed"
+        else
+          ((FAILED++))
+          echo "✗ $suite failed"
+        fi
+        echo ""
+      done
+      
+      # Run unit tests
+      echo "Running unit tests..."
+      if cargo test --lib mem_ingest 2>&1 | tail -100; then
+        echo "✓ mem_ingest passed"
+      else
+        ((FAILED++))
+        echo "✗ mem_ingest failed"
+      fi
+      echo ""
+      
+      if cargo test --lib mem_cli::query 2>&1 | tail -100; then
+        echo "✓ mem_cli::query passed"
+      else
+        ((FAILED++))
+        echo "✗ mem_cli::query failed"
+      fi
+      
+      echo ""
+      echo "=========================================="
+      echo "Test Summary: $PASSED passed, $FAILED failed"
+      echo "=========================================="
+      
+      if [ $FAILED -eq 0 ]; then
+        echo "PASS: All integration tests passed"
+        echo "PASS: All integration tests passed" > /tekton/results/summary
+        exit 0
+      else
+        echo "FAIL: $FAILED test suite(s) failed"
+        echo "FAIL: $FAILED test suite(s) failed" > /tekton/results/summary
+        exit 1
+      fi
+
+  resources: