harden history find tokens and shops earch

RETRIEX_SHOP_CONTEXT_SSE_GUARD_HOTFIX_README.md

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+# RetrieX Shop Context + SSE Guard Hotfix
+
+Patch-only hotfix for the Shopware query meta-command flow and duplicate SSE reconnect handling.
+
+## Problem
+
+After the user asked a domain question and then wrote a meta-command like `suche im shop`, the system could either:
+
+- fail to recover the previous domain question from history,
+- ask for a concrete search query even though a relevant previous question existed,
+- continue with a misleading RAG-only final answer after the shop search was skipped,
+- append a misleading duplicate SSE reconnect message such as `Der Antwort-Stream läuft bereits...`.
+
+## Changes
+
+- The shop meta-command fallback now uses a larger history budget.
+- If the budgeted history is still polluted by repeated meta turns, the fallback checks the full recent context as a last resort.
+- The fallback still ignores meta-only turns such as `shop` / `suche im shop` and derives a compact shop query from the last non-meta domain question.
+- If no concrete shop query can be resolved, the agent now stops after the clarification message instead of generating a misleading final answer from RAG context.
+- Duplicate EventSource reconnects for already-running or completed jobs are silently closed with `done`, so the UI does not append a misleading stream error after the real stream already produced output.
+
+## Expected behavior
+
+Conversation:
+
+```text
+mit welchem testomat kann ich freies chlor messen
+suche im shop
+```
+
+Expected Shop query:
+
+```text
+testomat freies chlor
+```
+
+Not expected:
+
+```text
+shop
+mit welchem testomat kann ich freies chlor messen
+```
+
+## Notes
+
+- No retrieval logic changed.
+- No scoring logic changed.
+- No product-family special case was added.
+- No Testomat 808 / Testomat 2000 / Tritromat special handling was added.
+- Existing config fallbacks remain intact.
+
+## After applying
+
+Run:
+
+```bash
+php bin/console cache:clear
+php bin/console mto:agent:config:validate
+php bin/console mto:agent:regression:test
+```