refactor(router): drop unused ctx param from pure helpers (PR #203 review nit)

splitContent/sortFiles don't touch RouterContext — the uniform ctx-first
param was a mechanical-extraction artifact. Removed from both defs and
their two call sites. Indentation nit deliberately NOT addressed: the
retained class-method indentation is what makes the extraction a
byte-verifiable behaviour-preserving move (per the review's normalized
diff); reflowing would destroy that property for zero functional gain.

tsc clean, lint baseline, 235/235.

Author: aaronsb

src/semantic/operations/vault.ts

@@ -435,7 +435,7 @@ export async function executeVaultOperation(ctx: RouterContext, action: string,
         }
 
         // Split the content
-        const splitFiles = splitContent(ctx, sourceFile.content, params);
+        const splitFiles = splitContent(sourceFile.content, params);
 
         // Create output files
         const createdFiles = [];
@@ -539,7 +539,7 @@ export async function executeVaultOperation(ctx: RouterContext, action: string,
 
         // Sort files if requested
         if (sortBy) {
-          sortFiles(ctx, sourceFiles, sortBy, sortOrder);
+          sortFiles(sourceFiles, sortBy, sortOrder);
         }
 
         // Combine content
@@ -642,7 +642,7 @@ export async function executeVaultOperation(ctx: RouterContext, action: string,
     }
   }
 
-function splitContent(ctx: RouterContext, content: string, params: Params): Array<{ content: string }> {
+function splitContent(content: string, params: Params): Array<{ content: string }> {
     const splitBy = paramStr(params, 'splitBy');
     const delimiter = paramStr(params, 'delimiter');
     const level = paramNum(params, 'level');
@@ -766,7 +766,7 @@ function splitContent(ctx: RouterContext, content: string, params: Params): Arra
     return splitFiles.length > 0 ? splitFiles : [{ content }];
   }
 
-function sortFiles(ctx: RouterContext, files: Array<{ path: string; content: string }>, sortBy: string, sortOrder: string): void {
+function sortFiles(files: Array<{ path: string; content: string }>, sortBy: string, sortOrder: string): void {
     // For file metadata, we'd need to use Obsidian's API
     // For now, we'll sort by name and size (which we can calculate)