Fix terminalUpdateStatuses to exclude failed status

[Copilot]

The terminalUpdateStatuses array included "failed", which could cause failed operations to be incorrectly marked as succeeded if the explicit failure check was bypassed.

Change

Removed "failed" from terminalUpdateStatuses in memoryStoreUpdatePoller.ts:

// Before
const terminalUpdateStatuses: MemoryStoreUpdateStatus[] = ["completed", "superseded", "failed"];

// After
const terminalUpdateStatuses: MemoryStoreUpdateStatus[] = ["completed", "superseded"];

Logic Flow

The applyUpdateState function handles statuses in this order:

1. Lines 111-118: Explicit "failed" check → sets state.status = "failed"
2. Lines 121-128: terminalUpdateStatuses check → sets state.status = "succeeded"
3. Line 131: Default → sets state.status = "running"

With "failed" in terminalUpdateStatuses, any logic error allowing "failed" to reach line 121 would incorrectly mark it as succeeded. This fix ensures only non-error terminal statuses ("completed", "superseded") are treated as success.

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