fix(hooks): keep MCP reachability probes bounded

Remove the redundant JSON-RPC initialize fallback from the consolidated MCP health-check batch. A routed 404 already proves the endpoint is reachable, and the real authenticated MCP call remains authoritative. Avoiding the fallback also prevents a stalled GET plus stalled POST from consuming twice the configured hook timeout.

scripts/hooks/mcp-health-check.js

@@ -256,28 +256,19 @@ function detectFailureCode(text) {
   return null;
 }
 
-function requestHttp(urlString, headers, timeoutMs, options = {}) {
+function requestHttp(urlString, headers, timeoutMs) {
   return new Promise(resolve => {
     let settled = false;
     let timedOut = false;
 
     const url = new URL(urlString);
     const client = url.protocol === 'https:' ? https : http;
-    const method = options.method || 'GET';
-    const body = options.body || null;
-    const requestHeaders = { ...headers };
-
-    if (body) {
-      requestHeaders['content-type'] = 'application/json';
-      requestHeaders['content-length'] = Buffer.byteLength(body);
-      requestHeaders.accept = 'application/json, text/event-stream';
-    }
 
     const req = client.request(
       url,
       {
-        method,
-        headers: requestHeaders,
+        method: 'GET',
+        headers,
       },
       res => {
         if (settled) return;
@@ -306,23 +297,7 @@ function requestHttp(urlString, headers, timeoutMs, options = {}) {
       });
     });
 
-    req.end(body || undefined);
-  });
-}
-
-// Some Streamable HTTP MCP servers (e.g. api.telnyx.com/v2/mcp) only route POST
-// and answer any GET with 404, so a bare GET proves nothing. Replay the probe as
-// a real JSON-RPC initialize before declaring the server unreachable.
-function mcpInitializeBody() {
-  return JSON.stringify({
-    jsonrpc: '2.0',
-    id: 1,
-    method: 'initialize',
-    params: {
-      protocolVersion: '2025-06-18',
-      capabilities: {},
-      clientInfo: { name: 'ecc-mcp-health-check', version: '1' }
-    }
+    req.end();
   });
 }
 
@@ -541,19 +516,7 @@ async function probeServer(serverName, resolvedConfig) {
   const config = resolvedConfig.config;
 
   if (config.type === 'http' || config.url) {
-    const timeoutMs = envNumber('ECC_MCP_HEALTH_TIMEOUT_MS', DEFAULT_TIMEOUT_MS);
-    let result = await requestHttp(config.url, config.headers || {}, timeoutMs);
-
-    if (!result.ok) {
-      const posted = await requestHttp(config.url, config.headers || {}, timeoutMs, {
-        method: 'POST',
-        body: mcpInitializeBody()
-      });
-
-      if (posted.ok) {
-        result = posted;
-      }
-    }
+    const result = await requestHttp(config.url, config.headers || {}, envNumber('ECC_MCP_HEALTH_TIMEOUT_MS', DEFAULT_TIMEOUT_MS));
 
     return {
       ok: result.ok,