feat(tui): removed cursor positioning and refactored TUI rendering with explicit env defaults

- Removed getCursorPosition() method from Component interface and implementations, eliminating hardware cursor positioning support.
- Changed PI_HARDWARE_CURSOR environment variable default from implicit true to explicit '1' with fallback pattern.
- Changed PI_CLEAR_ON_SHRINK environment variable default from implicit false to explicit '0' with fallback pattern.
- Added screen clearing on TUI startup to prevent shell prompts from bleeding into first rendered frame.
- Refactored full-render logic into reusable fullRender() helper function.

packages/coding-agent/src/cli/args.ts

@@ -21,12 +21,11 @@ export interface Args {
 	appendSystemPrompt?: string;
 	thinking?: ThinkingLevel;
 	continue?: boolean;
-	resume?: boolean;
+	resume?: string | true;
 	help?: boolean;
 	version?: boolean;
 	mode?: Mode;
 	noSession?: boolean;
-	session?: string;
 	sessionDir?: string;
 	models?: string[];
 	tools?: string[];
@@ -76,8 +75,13 @@ export function parseArgs(args: string[], extensionFlags?: Map<string, { type: "
 			}
 		} else if (arg === "--continue" || arg === "-c") {
 			result.continue = true;
-		} else if (arg === "--resume" || arg === "-r") {
-			result.resume = true;
+		} else if (arg === "--resume" || arg === "-r" || arg === "--session") {
+			const next = args[i + 1];
+			if (next && !next.startsWith("-")) {
+				result.resume = args[++i];
+			} else {
+				result.resume = true;
+			}
 		} else if (arg === "--provider" && i + 1 < args.length) {
 			result.provider = args[++i];
 		} else if (arg === "--model" && i + 1 < args.length) {
@@ -96,8 +100,6 @@ export function parseArgs(args: string[], extensionFlags?: Map<string, { type: "
 			result.appendSystemPrompt = args[++i];
 		} else if (arg === "--no-session") {
 			result.noSession = true;
-		} else if (arg === "--session" && i + 1 < args.length) {
-			result.session = args[++i];
 		} else if (arg === "--session-dir" && i + 1 < args.length) {
 			result.sessionDir = args[++i];
 		} else if (arg === "--models" && i + 1 < args.length) {