* fix(mcp): drain the config read-modify-write across cancellation
Route the five MCP config endpoints through the canonical
run_drained_write helper and fold the tools-cache reset into the drained
unit, so a cancelled caller cannot detach from the worker holding the
extensions-config locks or skip the cache invalidation behind a settled
write. Caller-facing HTTPException contracts re-raise unlogged.
Fixes#6209
* fix(mcp): type the drain helper against the worker signature and unlist drain adopters
- _run_drained_mcp_apply now mirrors the canonical helper's [**P, T]
Callable[P, T] typing so each call site's argument list is checked;
- AGENTS.md stops enumerating the adopted routers, so the line stops
needing an edit on every new adopter.
---------
Co-authored-by: xiaodu55 <xiaodu55@users.noreply.github.com>
6176b057a2