refactor(hashline-edit): remove unnecessary barrel re-exports of internal primitives

applySetLine, applyReplaceLines, applyInsertAfter, applyInsertBefore
were re-exported from both edit-operations.ts and index.ts but have no
external consumers — they are only used internally within the module.
Only applyHashlineEdits (the public API) remains exported.

src/tools/hashline-edit/edit-operations.ts

@@ -88,9 +88,3 @@ export function applyHashlineEdits(content: string, edits: HashlineEdit[]): stri
   return applyHashlineEditsWithReport(content, edits).content
 }
 
-export {
-  applySetLine,
-  applyReplaceLines,
-  applyInsertAfter,
-  applyInsertBefore,
-} from "./edit-operation-primitives"