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]>

crates/mem-store/migrations/009_temporal_edge_migration.sql

@@ -1,20 +1,20 @@
--- Migration 009: Temporal edge schema (Zep paper §2.2.2)
--- Replaces old memory_edge (child_sha/parent_sha node graph)
--- with temporal edge schema supporting relation types, facts, and validity periods.
+-- Migration 009: Temporal knowledge graph edge schema (Zep paper §2.2.2)
+-- Replaces old memory_edge (child_sha/parent_sha provenance DAG)
+-- with temporal edge schema for the knowledge graph.
 -- Idempotent: safe to run multiple times.
 
--- Rename old table if it still exists (skip if already migrated)
+-- Rename old provenance DAG table if it still has child_sha columns
 DO $$
 BEGIN
     IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'memory_edge'
                AND EXISTS (SELECT 1 FROM information_schema.columns 
                           WHERE table_name = 'memory_edge' AND column_name = 'child_sha'))
     THEN
-        ALTER TABLE memory_edge RENAME TO memory_edge_legacy;
+        ALTER TABLE memory_edge RENAME TO memory_edge_provenance;
     END IF;
 END $$;
 
--- Create temporal edge table
+-- Create temporal knowledge graph edge table
 CREATE TABLE IF NOT EXISTS memory_edge (
     id TEXT PRIMARY KEY,
     project_id TEXT NOT NULL DEFAULT 'default',
@@ -64,4 +64,5 @@ CREATE UNIQUE INDEX IF NOT EXISTS idx_memory_entity_project_name ON memory_entit
 
 -- ROLLBACK instructions:
 -- DROP TABLE IF EXISTS memory_edge;
--- ALTER TABLE IF EXISTS memory_edge_legacy RENAME TO memory_edge;
+-- ALTER TABLE IF EXISTS memory_edge_provenance RENAME TO memory_edge;
+-- DROP INDEX IF EXISTS idx_memory_entity_project_name;