fix(coding-agent): added gap separators between noncontiguous search matches

- SearchTool now tracked the last emitted line and inserted ellipsis markers when noncontiguous match blocks were output.
- Display output gap markers were padded to align with code-frame gutters.
- Added a regression test that verified a no-context search emits an ellipsis between separated matches in the same file.

packages/coding-agent/src/tools/search.ts

@@ -328,11 +328,18 @@ export class SearchTool implements AgentTool<typeof searchSchema, SearchToolDeta
 					return nextWidth;
 				}, 0);
 				const cacheEntries: Array<readonly [number, string]> = [];
+				let lastEmittedLine: number | undefined;
+				const gutterPad = " ".repeat(lineNumberWidth + 1);
 				for (const match of fileMatches) {
 					const pushLine = (lineNumber: number, line: string, isMatch: boolean, recordable: boolean) => {
+						if (lastEmittedLine !== undefined && lineNumber > lastEmittedLine + 1) {
+							modelOut.push("...");
+							displayOut.push(`${gutterPad}│...`);
+						}
 						modelOut.push(formatMatchLine(lineNumber, line, isMatch, { useHashLines }));
 						displayOut.push(formatCodeFrameLine(isMatch ? "*" : " ", lineNumber, line, lineNumberWidth));
 						if (recordable) cacheEntries.push([lineNumber, line] as const);
+						lastEmittedLine = lineNumber;
 					};
 					if (match.contextBefore) {
 						for (const ctx of match.contextBefore) {

packages/coding-agent/test/tools.test.ts

@@ -1419,6 +1419,24 @@ function b() {
 			expect(output).toMatch(/\*5\|match two/);
 		});
 
+		it("inserts a gap separator between non-contiguous match blocks", async () => {
+			const testFile = path.join(testDir, "gaps.txt");
+			const lines = Array.from({ length: 10 }, (_, idx) => (idx === 0 || idx === 5 ? "match" : `filler ${idx}`));
+			fs.writeFileSync(testFile, lines.join("\n"));
+
+			const noContextSettings = Settings.isolated({ "search.contextBefore": 0, "search.contextAfter": 0 });
+			const noContextSearchTool = wrapToolWithMetaNotice(
+				new SearchTool(createTestToolSession(testDir, noContextSettings)),
+			);
+			const result = await noContextSearchTool.execute("test-call-12-gap", {
+				pattern: "match",
+				paths: [testFile],
+			});
+
+			const output = getTextOutput(result);
+			expect(output).toMatch(/\*1\|match\n\.\.\.\n\*6\|match/);
+		});
+
 		it("should paginate files via the skip parameter", async () => {
 			const skipDir = path.join(testDir, "skip-dir");
 			fs.mkdirSync(skipDir, { recursive: true });