fix: align discussion workspace and tool schemas

plugin/tools/register-tools.ts

@@ -13,6 +13,7 @@ type ToolDeps = {
       originChannelId: string;
       initiatorAgentId: string;
       initiatorSessionId: string;
+      initiatorWorkspaceRoot?: string;
       discussGuide: string;
     }) => Promise<unknown>;
     handleCallback: (params: {
@@ -119,6 +120,7 @@ export function registerDirigentTools(deps: ToolDeps): void {
           originChannelId: callbackChannelId,
           initiatorAgentId: String((params.__agentId as string | undefined) || ""),
           initiatorSessionId: String((params.__sessionKey as string | undefined) || ""),
+          initiatorWorkspaceRoot: typeof params.__workspaceRoot === "string" ? params.__workspaceRoot : undefined,
           discussGuide,
         });
       }
@@ -161,7 +163,7 @@ export function registerDirigentTools(deps: ToolDeps): void {
   api.registerTool({
     name: "dirigent_discord_control",
     description: "Create/update Discord private channels using the configured Discord bot token",
-    inputSchema: {
+    parameters: {
       type: "object",
       additionalProperties: false,
       properties: {
@@ -194,6 +196,7 @@ export function registerDirigentTools(deps: ToolDeps): void {
         ...(params as Record<string, unknown>),
         __agentId: ctx?.agentId,
         __sessionKey: ctx?.sessionKey,
+        __workspaceRoot: ctx?.workspaceRoot,
       };
       return executeDiscordAction(params.action as DiscordControlAction, nextParams);
     },
@@ -202,7 +205,7 @@ export function registerDirigentTools(deps: ToolDeps): void {
   api.registerTool({
     name: "discuss-callback",
     description: "Close a discussion channel and notify the origin work channel with the discussion summary path",
-    inputSchema: {
+    parameters: {
       type: "object",
       additionalProperties: false,
       properties: {