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,