[oh-my-openagent] [Bug] Built-in grep_app and websearch remote MCPs fail with SSE error 405 (Non-200 status) on every session

## Observed symptom [Bug] Built-in grep_app and websearch remote MCPs fail with SSE error 405 (Non-200 status) on every session On every OpenCode session start, both of OmO's built-in **remote** MCPs fail, and the TUI surfaces an error toast: `grep_app SSE error: Non-200 status code (405)` ## Literal error text ``` | 404 | — | — | The 405 comes from the MCP SDK's ``` ## Environment GitHub code-yeongyu/oh-my-openagent #9050 ## Trigger / context Public GitHub report in code-yeongyu/oh-my-openagent (FRESH_7D). ## Source evidence - https://github.com/code-yeongyu/oh-my-openagent/issues/9050 (2026-09-28T03:30:32Z) — evidence_class: PRIMARY_ISSUE_REPORT — #9050 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T09:52:00.922591Z - scout_id: C5fcfb7cb74 ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.