feat(grid-agent): add structured observability and replay (#127)

crates/metacrate-grid-agent/tests/dependency_policy.rs

@@ -48,7 +48,7 @@ fn runtime_source_has_no_subprocess_or_native_abi_escape_hatch() {
     let mut files = Vec::with_capacity(20);
     collect_rust_files(&source, &mut files);
     assert!(
-        files.len() <= 24,
+        files.len() <= 26,
         "source-file count needs a reviewed bound update"
     );
     for path in files {