feat(coding-agent): added cell-by-cell Python execution tracking with duration and exit codes

- Added cell-by-cell Python execution tracking with duration and exit codes.
- Added template system with {{placeholders}} for task tool context rendering.
- Enhanced patch applicator to preserve exact indentation when intended.
- Changed Python tool to use cells array instead of single code parameter.
- Updated task tool schema to require vars instead of task field.

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

@@ -1,7 +1,6 @@
 import { describe, expect, it } from "bun:test";
 import stripAnsi from "strip-ansi";
 import { pythonToolRenderer } from "../../src/core/tools/python";
-import { truncateTail } from "../../src/core/tools/truncate";
 import { getThemeByName } from "../../src/modes/interactive/theme/theme";
 
 describe("pythonToolRenderer", () => {
@@ -11,26 +10,37 @@ describe("pythonToolRenderer", () => {
 		const uiTheme = theme!;
 
 		const fullOutput = ["line 1", "line 2", "line 3", "line 4"].join("\n");
-		const truncation = truncateTail(fullOutput, { maxLines: 2, maxBytes: 128 });
 
 		const result = {
-			content: [{ type: "text", text: truncation.content }],
+			content: [{ type: "text", text: fullOutput }],
 			details: {
-				truncation,
-				fullOutput,
+				cells: [
+					{
+						index: 0,
+						title: "run",
+						code: "print('hello')",
+						output: fullOutput,
+						status: "complete" as const,
+						durationMs: 12,
+					},
+				],
 			},
 		};
 
-		const collapsed = pythonToolRenderer.renderResult(result, { expanded: false, isPartial: false }, uiTheme);
+		const collapsed = pythonToolRenderer.renderResult(
+			result,
+			{ expanded: false, isPartial: false, renderContext: { previewLines: 2 } },
+			uiTheme,
+		);
 		const collapsedLines = stripAnsi(collapsed.render(80).join("\n"));
 		expect(collapsedLines).toContain("line 4");
 		expect(collapsedLines).not.toContain("line 1");
-		expect(collapsedLines).toContain("Truncated:");
+		expect(collapsedLines).toContain("more lines");
 
 		const expanded = pythonToolRenderer.renderResult(result, { expanded: true, isPartial: false }, uiTheme);
 		const expandedLines = stripAnsi(expanded.render(80).join("\n"));
 		expect(expandedLines).toContain("line 1");
 		expect(expandedLines).toContain("line 4");
-		expect(expandedLines).not.toContain("Truncated:");
+		expect(expandedLines).not.toContain("more lines");
 	});
 });