feat: production ingest test suite with detailed logging

Add comprehensive E2E test scripts and logging for production testing:

- test_prod_ingest_real.sh: Full ingest test against K8s cluster with api-gw
- apply_migrations.sh: Manual database schema migration (backup method)
- collect_prod_logs.sh: Pod log collection before/after tests
- run_production_test.sh: Orchestrates full test + log collection
- tests/integration_ingest_with_gw.rs: Integration test with embeddings
- tests/unit_ingest_logging.rs: Unit tests for extraction pipeline

Enhanced logging in ingest_worker.rs:
- Per-record event tracking (extraction, save)
- Entity and edge operation logging
- Error accumulation and reporting
- Structured logging for observability

Production testing identified root cause:
- Ingest + embedding pipeline working correctly
- Entity extraction functional
- Database schema missing (migration not applied)
- Logs clearly show: relation "memory_entity" does not exist

Next: Trigger DB Migration workflow in Forgejo Actions to apply
crates/mem-store/migrations/*.sql files.

run_production_test.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+
+# Master script: Run full production ingest test with logging
+#
+# Usage:
+#   ./run_production_test.sh
+#   ./run_production_test.sh [api-key]
+#
+# What it does:
+#   1. Collect baseline logs
+#   2. Run ingest test
+#   3. Collect post-test logs
+#   4. Analyze for errors
+#   5. Display results
+
+set -e
+
+API_KEY="${1:-test-key}"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo ""
+echo "╔═════════════════════════════════════════╗"
+echo "║  Production Ingest Test with api-gw    ║"
+echo "║  (Full root-cause error logging)       ║"
+echo "╚═════════════════════════════════════════╝"
+echo ""
+
+# Verify scripts exist
+for script in test_production_ingest.sh collect_prod_logs.sh; do
+  if [ ! -f "$SCRIPT_DIR/$script" ]; then
+    echo "✗ Missing: $script"
+    exit 1
+  fi
+done
+
+echo "Step 1: Collecting baseline logs..."
+"$SCRIPT_DIR/collect_prod_logs.sh" before
+
+echo ""
+echo "Step 2: Running ingest test..."
+echo "  (Sending records through embedding pipeline to api-gw)"
+echo ""
+
+if MEM_API_KEY="$API_KEY" "$SCRIPT_DIR/test_production_ingest.sh"; then
+  echo ""
+  echo "✓ Test passed!"
+  test_status=0
+else
+  echo ""
+  echo "✗ Test failed!"
+  test_status=1
+fi
+
+echo ""
+echo "Step 3: Collecting post-test logs..."
+"$SCRIPT_DIR/collect_prod_logs.sh" after
+
+echo ""
+echo "Step 4: Analyzing logs for errors..."
+echo ""
+"$SCRIPT_DIR/collect_prod_logs.sh" analyze
+
+echo ""
+echo "════════════════════════════════════════"
+if [ $test_status -eq 0 ]; then
+  echo "✓ INGEST TEST PASSED"
+else
+  echo "✗ INGEST TEST FAILED"
+  echo ""
+  echo "Next steps:"
+  echo "  1. Check logs in prod_logs_*/ directory"
+  echo "  2. Look for errors in:"
+  echo "     - /memory/ingest endpoint response"
+  echo "     - Embedding service (LLM_ENDPOINT)"
+  echo "     - api-gw gateway logs"
+  echo "     - Database connection"
+fi
+echo "════════════════════════════════════════"
+echo ""
+
+exit $test_status