fix(windows): route background agent auth checks through aoprocess to suppress console window flashes

[sriram687]

Description

This PR addresses a Windows-specific user experience issue where brief command prompt window flashes would appear on the user's desktop whenever the local daemon ran background status/auth probes for registered agent CLIs.

Root Cause

Several agent adapters (specifically authprobe.go, claudecode.go, codex.go, copilot/auth.go, kilocode/auth.go, and opencode.go) were calling the standard Go library exec.CommandContext(...) directly to probe status. On Windows, executing shell commands from a background/GUI application (like the AO daemon or the Electron wrapper) without specifying console window creation flags forces Windows to draw and temporarily flash a console window.

Solution

We swapped direct standard library exec.CommandContext(...) usage for the project's native aoprocess.CommandContext(...) helper (from backend/internal/process). The aoprocess package properly configures Windows execution flags (windows.CREATE_NO_WINDOW and HideWindow: true) to ensure all background child processes run completely invisibly.

Changes

The following files were updated to import aoprocess and call aoprocess.CommandContext(...) for background probes:

• backend/internal/adapters/agent/authprobe/authprobe.go
• backend/internal/adapters/agent/claudecode/claudecode.go
• backend/internal/adapters/agent/codex/codex.go
• backend/internal/adapters/agent/copilot/auth.go
• backend/internal/adapters/agent/kilocode/auth.go
• backend/internal/adapters/agent/opencode/opencode.go

Verification

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[somewherelostt]

Thanks for contributing to Agent Orchestrator.

This PR is being picked up by the current external contributor on-call pair:

• @illegalcall
• @Pulkit7070

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