fix sse HANGING tasks

RETRIEX_SSE_RUNNING_RECONNECT_FINALIZE_FIX_README.md

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+# RetrieX SSE running reconnect / final cleanup fix
+
+Patch-only fix for the streamed answer UI after the job-based SSE flow.
+
+## Problem
+
+After introducing stream jobs, an EventSource reconnect to an already running job could receive:
+
+```text
+retry: 15000
+
+: duplicate-or-finished-stream
+
+event: done
+data: [DONE]
+```
+
+Because `running` jobs were treated like harmless duplicate/finished streams, the browser could finalize an incomplete answer as if it had completed successfully. In addition, the final `done` cleanup still used the streaming cleanup path, which can keep the last `.think` block visible.
+
+## Changes
+
+- `running` duplicate/reconnect streams are no longer silently closed as successful `[DONE]` completions.
+- Only already `completed` duplicate streams are silently closed with `done`.
+- A reconnect to a still-running job now follows the existing explicit error path, so the UI can show a clear interruption message instead of silently accepting a partial answer.
+- Final stream completion now removes all `.think` blocks and the loader class.
+
+## Changed files
+
+- `src/Controller/AskSseController.php`
+- `public/assets/js/base.js`
+
+## After installing
+
+Run:
+
+```bash
+php bin/console cache:clear
+php bin/console mto:agent:config:validate
+php bin/console mto:agent:regression:test
+```
+
+Also hard-refresh the browser or clear browser cache because `public/assets/js/base.js` is client-side JavaScript.