chore: Second cleanup wave - organize root directory

- Archive: 85 agent .txt files → docs/archive/agents/legacy_txt/
- Scripts: Move 110 shell scripts → scripts/ (keep deploy.sh in root)
- Models: Move 18 .safetensors → ml/models/checkpoints/training_artifacts/
- Delete: 34 directories (~33GB freed) - target/, coverage_*, test artifacts
- Build: Clean 14 build artifacts (.rlib, .o, .pid, binaries)
- Tests: Move 14 .rs files → tests/standalone/
- SQL: Move 5 files → sql/ (keep init-db*.sql for Docker)
- Wave 153: Archive to docs/archive/historical/wave153/
- Docs: Archive 9 markdown files to wave_d/reports/ and historical/

Total impact: ~34GB freed (both waves), root directory cleaned from 583 to ~40 essential files
Directory count reduced from 65 to 31 (52% reduction)
All historical data preserved in organized archive structure

sql/test_pg_performance.sql

@@ -0,0 +1,94 @@
+-- PostgreSQL Performance Test Script
+-- Tests connection pool performance and throughput
+
+\timing on
+
+-- Test 1: Basic query performance
+SELECT 'Test 1: Basic query performance' as test;
+SELECT COUNT(*) FROM config_settings;
+
+-- Test 2: Temporary table creation and inserts
+SELECT 'Test 2: Creating temporary test table' as test;
+CREATE TEMP TABLE perf_test (
+    id SERIAL PRIMARY KEY,
+    trade_id VARCHAR(50),
+    symbol VARCHAR(10),
+    price DECIMAL(18,8),
+    quantity DECIMAL(18,8),
+    timestamp TIMESTAMPTZ DEFAULT NOW()
+);
+
+-- Test 3: Bulk insert performance (1000 records)
+SELECT 'Test 3: Bulk insert 1000 records' as test;
+INSERT INTO perf_test (trade_id, symbol, price, quantity)
+SELECT
+    'TRADE_' || generate_series || '_' || extract(epoch from now()),
+    CASE (random() * 5)::int
+        WHEN 0 THEN 'BTC/USD'
+        WHEN 1 THEN 'ETH/USD'
+        WHEN 2 THEN 'AAPL'
+        WHEN 3 THEN 'GOOGL'
+        ELSE 'MSFT'
+    END,
+    (random() * 1000)::decimal(18,8),
+    (random() * 100)::decimal(18,8)
+FROM generate_series(1, 1000);
+
+-- Test 4: Query performance on test data
+SELECT 'Test 4: Query performance (aggregation)' as test;
+SELECT symbol, COUNT(*) as trade_count, AVG(price) as avg_price
+FROM perf_test
+GROUP BY symbol;
+
+-- Test 5: Index creation and query optimization
+SELECT 'Test 5: Creating index' as test;
+CREATE INDEX idx_perf_test_symbol_timestamp ON perf_test(symbol, timestamp DESC);
+
+-- Test 6: Indexed query performance
+SELECT 'Test 6: Indexed query performance' as test;
+SELECT * FROM perf_test WHERE symbol = 'BTC/USD' ORDER BY timestamp DESC LIMIT 100;
+
+-- Test 7: Transaction performance (1000 individual inserts)
+SELECT 'Test 7: Transaction performance (1000 individual inserts)' as test;
+BEGIN;
+DO $$
+DECLARE
+    i INT;
+BEGIN
+    FOR i IN 1..1000 LOOP
+        INSERT INTO perf_test (trade_id, symbol, price, quantity)
+        VALUES (
+            'TRADE_TX_' || i || '_' || extract(epoch from now()),
+            CASE (random() * 5)::int
+                WHEN 0 THEN 'BTC/USD'
+                WHEN 1 THEN 'ETH/USD'
+                WHEN 2 THEN 'AAPL'
+                WHEN 3 THEN 'GOOGL'
+                ELSE 'MSFT'
+            END,
+            (random() * 1000)::decimal(18,8),
+            (random() * 100)::decimal(18,8)
+        );
+    END LOOP;
+END $$;
+COMMIT;
+
+-- Test 8: Final statistics
+SELECT 'Test 8: Final statistics' as test;
+SELECT COUNT(*) as total_records FROM perf_test;
+
+-- Test 9: Connection and pool statistics
+SELECT 'Test 9: Database statistics' as test;
+SELECT
+    numbackends as active_connections,
+    xact_commit as committed_transactions,
+    xact_rollback as rolled_back_transactions,
+    blks_read as blocks_read,
+    blks_hit as blocks_hit,
+    tup_returned as tuples_returned,
+    tup_fetched as tuples_fetched,
+    tup_inserted as tuples_inserted
+FROM pg_stat_database
+WHERE datname = 'foxhunt';
+
+SELECT 'Performance test completed!' as status;