fix(coding-agent): resolved symlinked paths before passing to brush

- Resolved symlinked paths before passing to brush shell to keep `pwd` output aligned with canonical Git worktree paths.
- Added `resolveShellCwd` helper that safely resolves symlinks and falls back to original path on error.
- Added test case verifying symlinked directories are canonicalized before execution.

packages/coding-agent/test/bash-executor.test.ts

@@ -39,6 +39,20 @@ describe("executeBash", () => {
 		expect(result.output.trim()).toBe(tempDir);
 	});
 
+	it("canonicalizes symlinked cwd before execution", async () => {
+		if (process.platform === "win32") {
+			return;
+		}
+
+		const realDir = path.join(tempDir, "real");
+		const linkDir = path.join(tempDir, "link");
+		fs.mkdirSync(realDir);
+		fs.symlinkSync(realDir, linkDir, "dir");
+
+		const result = await executeBash("pwd", { cwd: linkDir, timeout: 5000 });
+		expect(result.output.trim()).toBe(fs.realpathSync(linkDir));
+	});
+
 	it("passes env vars", async () => {
 		const result = await executeBash("echo $PI_TEST_ENV", {
 			cwd: tempDir,

packages/coding-agent/test/session-manager/signature-persistence.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "bun:test";
-import { SessionManager } from "@oh-my-pi/pi-coding-agent/session/session-manager";
 import type { AssistantMessage } from "@oh-my-pi/pi-ai";
+import { SessionManager } from "@oh-my-pi/pi-coding-agent/session/session-manager";
 import { TempDir } from "@oh-my-pi/pi-utils";
 
 describe("SessionManager signature persistence", () => {
@@ -33,8 +33,11 @@ describe("SessionManager signature persistence", () => {
 		await session.flush();
 
 		const reloaded = await SessionManager.open(session.getSessionFile()!);
-		const assistant = reloaded.getEntries().find(entry => entry.type === "message" && entry.message.role === "assistant")
-			?.message as AssistantMessage | undefined;
+		const assistant = reloaded
+			.getEntries()
+			.find(entry => entry.type === "message" && entry.message.role === "assistant")?.message as
+			| AssistantMessage
+			| undefined;
 
 		expect(assistant).toBeDefined();
 		expect(assistant?.content[0]).toMatchObject({ type: "thinking", thinking: "reasoning", thinkingSignature: "" });