test: reduce brittle assertions and test-only runtime paths (#9289)

* test: focus assertions on behavioral evidence

Prune redundant and wording-coupled checks while retaining diagnostic, parser, recovery, and cleanup coverage.

* refactor: remove test-only wrappers and duplicate checks

Exercise production operations through test fixtures, remove unused adapters, and keep managed-member uncertainty guidance under its existing owner.

* test: focus process validation on diagnostic facts

* refactor: remove test-only runtime helpers

Move semantic evidence fixture setup out of runtime and remove unused Windows settle recovery helpers while checking configured defaults independently.

* test: focus artifact diagnostics on format facts

* test: verify retained cleanup guidance delivery

src/cli/cliOutputFormatter.ts

@@ -227,18 +227,6 @@ export const delimitedOutputInputError = (
     { path, reason: "invalid_value", message },
   ]);
 
-/** Render a validated row page, preceded by a versioned metadata record. */
-export const formatDelimitedRows = (
-  rows: unknown,
-  format: "csv" | "tsv",
-  options: CliDelimitedOutputOptions,
-): Result<string, AnalysisInputError> => {
-  const prepared = prepareDelimitedOutput(rows, format, options);
-  return prepared.ok
-    ? ok([...formatDelimitedOutputParts(prepared.value)].join(""))
-    : prepared;
-};
-
 /** Stream a page after its rows and cells have been validated and snapshotted. */
 export function* formatDelimitedOutputParts({
   encodedHeaders,