feat: move Coder Chat to secondary sidebar with agents experiment gate

- Move the coderChat view container from the bottom panel to the
  secondarySidebar contribution point (requires VS Code >= 1.106).
- Add coder.agentsEnabled context key, set by fetching
  /api/v2/experiments after login. The chat view is only visible
  when the agents experiment is enabled on the deployment.
- Bump engines.vscode from ^1.95.0 to ^1.106.0.

Author: ThomasK33

package.json

@@ -193,7 +193,7 @@
 					"icon": "media/tasks-logo.svg"
 				}
 			],
-			"panel": [
+			"secondarySidebar": [
 				{
 					"id": "coderChat",
 					"title": "Coder Chat (Experimental)",
@@ -237,7 +237,8 @@
 					"type": "webview",
 					"id": "coder.chatPanel",
 					"name": "Coder Chat (Experimental)",
-					"icon": "media/shorthand-logo.svg"
+					"icon": "media/shorthand-logo.svg",
+					"when": "coder.agentsEnabled"
 				}
 			]
 		},
@@ -574,7 +575,7 @@
 	],
 	"packageManager": "pnpm@10.32.1",
 	"engines": {
-		"vscode": "^1.95.0",
+		"vscode": "^1.106.0",
 		"node": ">= 20"
 	},
 	"icon": "media/logo.png",

src/core/contextManager.ts

@@ -4,6 +4,7 @@ const CONTEXT_DEFAULTS = {
 	"coder.authenticated": false,
 	"coder.isOwner": false,
 	"coder.loaded": false,
+	"coder.agentsEnabled": false,
 	"coder.workspace.connected": false,
 	"coder.workspace.updatable": false,
 } as const;

src/deployment/deploymentManager.ts

@@ -137,6 +137,7 @@ export class DeploymentManager implements vscode.Disposable {
 		this.registerAuthListener();
 		// Contexts must be set before refresh (providers check isAuthenticated)
 		this.updateAuthContexts(deployment.user);
+		this.updateExperimentContexts();
 		this.refreshWorkspaces();
 
 		const deploymentWithoutAuth: Deployment =
@@ -166,6 +167,7 @@ export class DeploymentManager implements vscode.Disposable {
 		this.oauthSessionManager.clearDeployment();
 		this.client.setCredentials(undefined, undefined);
 		this.updateAuthContexts(undefined);
+		this.contextManager.set("coder.agentsEnabled", false);
 		this.clearWorkspaces();
 	}
 
@@ -251,6 +253,26 @@ export class DeploymentManager implements vscode.Disposable {
 		this.contextManager.set("coder.isOwner", isOwner);
 	}
 
+	/**
+	 * Fetch enabled experiments and update context keys.
+	 * Runs in the background so it does not block login.
+	 */
+	private updateExperimentContexts(): void {
+		this.client.getAxiosInstance().get("/api/v2/experiments")
+			.then((resp) => {
+				const experiments: string[] = resp.data ?? [];
+				this.contextManager.set(
+					"coder.agentsEnabled",
+					experiments.includes("agents"),
+				);
+			})
+			.catch((err) => {
+				this.logger.warn("Failed to fetch experiments", err);
+				// Default to hidden when we cannot determine.
+				this.contextManager.set("coder.agentsEnabled", false);
+			});
+	}
+
 	/**
 	 * Refresh all workspace providers asynchronously.
 	 */

test/mocks/testHelpers.ts

@@ -504,6 +504,7 @@ export class MockCoderApi implements Pick<
 	| "getHost"
 	| "getAuthenticatedUser"
 	| "dispose"
+	| "getAxiosInstance"
 > {
 	private _host: string | undefined;
 	private _token: string | undefined;
@@ -541,6 +542,11 @@ export class MockCoderApi implements Pick<
 		this._disposed = true;
 	});
 
+	// Minimal axios-like stub for getAxiosInstance().
+	readonly getAxiosInstance = vi.fn(() => ({
+		get: vi.fn().mockResolvedValue({ data: [] }),
+	}));
+
 	/**
 	 * Get current host (for assertions)
 	 */