feat(ultraplan-local): v1.6.0 — /ultraresearch-local deep research command

Add /ultraresearch-local for structured research combining local codebase
analysis with external knowledge via parallel agent swarms. Produces research
briefs with triangulation, confidence ratings, and source quality assessment.

New command: /ultraresearch-local with modes --quick, --local, --external, --fg.
New agents: research-orchestrator (opus), docs-researcher, community-researcher,
security-researcher, contrarian-researcher, gemini-bridge (all sonnet).
New template: research-brief-template.md.

Integration: --research flag in /ultraplan-local accepts pre-built research
briefs (up to 3), enriches the interview and exploration phases. Planning
orchestrator cross-references brief findings during synthesis.

Design principle: Context Engineering — right information to right agent at
right time. Research briefs are structured artifacts in the pipeline:
ultraresearch → brief → ultraplan --research → plan → ultraexecute.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/hooks/hook-helper.mjs

@@ -0,0 +1,42 @@
+// hook-helper.mjs — Shared test helper for hook scripts.
+// Spawns a hook as a child process and feeds it JSON via stdin.
+
+import { execFile } from 'node:child_process';
+
+/**
+ * Run a hook script by spawning `node <scriptPath>` and piping `input` to stdin.
+ *
+ * @param {string} scriptPath - Absolute path to the hook .mjs file
+ * @param {object|string} input - JSON payload (object will be stringified)
+ * @returns {Promise<{ code: number, stdout: string, stderr: string }>}
+ */
+export function runHook(scriptPath, input) {
+  return runHookWithEnv(scriptPath, input, {});
+}
+
+/**
+ * Run a hook script with custom environment variables.
+ *
+ * @param {string} scriptPath - Absolute path to the hook .mjs file
+ * @param {object|string} input - JSON payload (object will be stringified)
+ * @param {Record<string, string>} envOverrides - Extra env vars to set
+ * @returns {Promise<{ code: number, stdout: string, stderr: string }>}
+ */
+export function runHookWithEnv(scriptPath, input, envOverrides) {
+  return new Promise((resolve) => {
+    const env = { ...process.env, ...envOverrides };
+    const child = execFile(
+      'node',
+      [scriptPath],
+      { timeout: 5000, env },
+      (err, stdout, stderr) => {
+        resolve({
+          code: child.exitCode ?? (err && err.code === 'ERR_CHILD_PROCESS_STDIO_FINAL' ? 0 : 1),
+          stdout: stdout || '',
+          stderr: stderr || '',
+        });
+      }
+    );
+    child.stdin.end(typeof input === 'string' ? input : JSON.stringify(input));
+  });
+}