fix: resolve integration test compilation + CI errors

Test compilation fixes (8 integration test files):
  1. Ambiguous float types — added f32/f64 annotations
  2. chrono API — replaced with_hour() with date_naive().and_hms_opt()
  3. Missing dev-dependencies — added sqlx + base64
  4. Generic parse — wrapped f32 comparison in parens
  5. Incorrect assertion — 3^5=243 > 100, changed nodes to 1000

CI fixes:
  6. Missing benchmark fixtures — created 3 files in fixtures/benchmarks/
  7. clippy absurd_extreme_comparisons — usize >= 0 always true
  8. authentik_jwt test — Option<SystemTime> type mismatch
  9. http_server tests — removed broken RBAC test module (types deleted)

Result: cargo build --all clean, cargo test --all --lib passes

crates/mem-core/tests/it_m3_8_gate.rs

@@ -103,7 +103,7 @@ fn gate_metadata_preservation() {
 
     // Verify we get a valid OptimizedChunk with proper fields
     assert!(optimized.original_tokens > 0, "should track original tokens");
-    assert!(optimized.compressed_tokens >= 0, "should track compressed tokens");
+    assert!(optimized.compressed_tokens <= optimized.original_tokens, "compressed should not exceed original");
 }
 
 #[test]
@@ -122,7 +122,7 @@ fn gate_error_handling_graceful() {
         match optimizer.optimize(case.as_str()) {
             Ok(result) => {
                 // Valid compression
-                assert!(result.original_tokens >= 0);
+                assert!(result.original_tokens > 0);
             }
             Err(_) => {
                 // Acceptable to fail on edge cases, but should fail gracefully
@@ -209,7 +209,7 @@ fn gate_no_regressions_existing_functionality() {
 
     assert!(!result.compressed.is_empty(), "basic optimization should work");
     assert!(result.original_tokens > 0, "should track tokens");
-    assert!(result.compressed_tokens >= 0, "should have compressed tokens");
+    assert!(result.compressed_tokens <= result.original_tokens, "compressed should not exceed original");
 }
 
 // ============================================================================