fix(claude-cli): --resume for continuing turns (reusing --session-id errored on turn 2)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/ai/claude_cli.js

@@ -59,6 +59,7 @@ import { createInterface } from 'readline';
  * @param {function} [opts.onEvent]        Called for each normalized event
  * @param {string}   [opts.claudeExe]      Path or name of claude binary (default: CLAUDE_EXE env or 'claude')
  * @param {string[]} [opts.tools]          Exclusive available-tools allowlist (--tools); removes built-ins
+ * @param {boolean}  [opts.resume]         Continue an existing session (--resume) vs create (--session-id)
  * @param {string}   [opts.home]           If set, overrides HOME in child env (for service-user creds)
  * @param {string}   [opts.cwd]            Working directory for the child process
  * @param {number}   [opts.timeoutMs]      Milliseconds before SIGTERM (default: 600000)
@@ -73,6 +74,7 @@ export async function runClaudeTurn(opts) {
     mcpConfigPath,
     allowedTools = [],
     tools = [],
+    resume = false,
     onEvent,
     claudeExe = process.env.CLAUDE_EXE || 'claude',
     home = process.env.VOID_CLAUDE_HOME,
@@ -89,7 +91,9 @@ export async function runClaudeTurn(opts) {
     '--verbose',
     '--include-partial-messages',
     '--append-system-prompt', systemPrompt,
-    '--session-id', sessionId,
+    // First turn creates the session (--session-id); later turns MUST continue
+    // it with --resume (reusing --session-id on an existing session errors).
+    ...(resume ? ['--resume', sessionId] : ['--session-id', sessionId]),
   ];
 
   if (mcpConfigPath) {