fix(node-sdk): remove unimplemented AHP harness code

- Remove HarnessServer class and JsHarnessServer interface
- Remove harness_server field from SessionOptions
- Remove a3s_ahp module reference that caused build failures
- This fixes CI build failures for Node SDK on all platforms

Author: RoyLin

sdk/node/index.d.ts

@@ -57,11 +57,6 @@ export interface JsSessionStore {
 export interface JsSecurityProvider {
   kind: string
 }
-/** Plain shim for `HarnessServer` — used as the `SessionOptions.harnessServer` field type. */
-export interface JsHarnessServer {
-  program: string
-  args: Array<string>
-}
 export interface SessionOptions {
   /** Override the default model. Format: "provider/model" (e.g., "openai/gpt-4o"). */
   model?: string
@@ -156,17 +151,6 @@ export interface SessionOptions {
   sessionId?: string
   /** Automatically save the session to the configured store after each turn (default: false). */
   autoSave?: boolean
-  /**
-   * External AHP harness server.
-   *
-   * Pass `new HarnessServer("python3", ["harness.py"])` to attach an external
-   * supervision process. The harness receives every `pre_tool_use` and `pre_prompt`
-   * event and can return `block`, `skip`, `retry`, or `continue`.
-   * ```js
-   * agent.session('.', { harnessServer: new HarnessServer('python3', ['harness.py']) });
-   * ```
-   */
-  harnessServer?: JsHarnessServer
 }
 /** A single message in conversation history. */
 export interface MessageObject {
@@ -580,27 +564,6 @@ export declare class DefaultSecurityProvider {
   kind: string
   constructor()
 }
-/**
- * External AHP harness server configuration.
- *
- * Pass to `SessionOptions.harnessServer` to attach an external harness process
- * that supervises every tool call and prompt in this session via JSON-RPC 2.0.
- *
- * ```js
- * agent.session('.', { harnessServer: new HarnessServer('python3', ['harness.py']) });
- * ```
- */
-export declare class HarnessServer {
-  program: string
-  args: Array<string>
-  /**
-   * Create a harness server config.
-   *
-   * @param program - Executable to launch (e.g. "python3")
-   * @param args    - Arguments passed to the executable (e.g. ["harness.py"])
-   */
-  constructor(program: string, args: Array<string>)
-}
 /** AI coding agent. Create with `Agent.create()`, then call `agent.session()`. */
 export declare class Agent {
   /**

sdk/node/src/lib.rs

@@ -418,39 +418,6 @@ impl DefaultSecurityProvider {
     }
 }
 
-/// Plain shim for `HarnessServer` — used as the `SessionOptions.harnessServer` field type.
-#[napi(object)]
-#[derive(Clone, Default)]
-pub struct JsHarnessServer {
-    pub program: String,
-    pub args: Vec<String>,
-}
-
-/// External AHP harness server configuration.
-///
-/// Pass to `SessionOptions.harnessServer` to attach an external harness process
-/// that supervises every tool call and prompt in this session via JSON-RPC 2.0.
-///
-/// ```js
-/// agent.session('.', { harnessServer: new HarnessServer('python3', ['harness.py']) });
-/// ```
-#[napi]
-pub struct HarnessServer {
-    pub program: String,
-    pub args: Vec<String>,
-}
-
-#[napi]
-impl HarnessServer {
-    /// Create a harness server config.
-    ///
-    /// @param program - Executable to launch (e.g. "python3")
-    /// @param args    - Arguments passed to the executable (e.g. ["harness.py"])
-    #[napi(constructor)]
-    pub fn new(program: String, args: Vec<String>) -> Self {
-        Self { program, args }
-    }
-}
 
 // ============================================================================
 // SessionOptions
@@ -538,15 +505,6 @@ pub struct SessionOptions {
     pub session_id: Option<String>,
     /// Automatically save the session to the configured store after each turn (default: false).
     pub auto_save: Option<bool>,
-    /// External AHP harness server.
-    ///
-    /// Pass `new HarnessServer("python3", ["harness.py"])` to attach an external
-    /// supervision process. The harness receives every `pre_tool_use` and `pre_prompt`
-    /// event and can return `block`, `skip`, `retry`, or `continue`.
-    /// ```js
-    /// agent.session('.', { harnessServer: new HarnessServer('python3', ['harness.py']) });
-    /// ```
-    pub harness_server: Option<JsHarnessServer>,
 }
 
 /// A single message in conversation history.
@@ -847,19 +805,6 @@ fn js_session_options_to_rust(options: Option<SessionOptions>) -> RustSessionOpt
     if o.auto_save.unwrap_or(false) {
         opts = opts.with_auto_save(true);
     }
-    if let Some(hs) = o.harness_server {
-        match get_runtime().block_on(a3s_ahp::AhpHookExecutor::spawn(
-            &hs.program,
-            hs.args.as_slice(),
-        )) {
-            Ok(executor) => {
-                opts = opts.with_hook_executor(executor);
-            }
-            Err(e) => {
-                eprintln!("a3s-code: AHP harness spawn failed: {e}");
-            }
-        }
-    }
     opts
 }