Follow frontmost app when placing new windows

[qeude]

Summary

• Capture the frontmost process when finalizing snapshots.
• Place non-floating windows spawned by the frontmost app on their assigned workspace and focus them.
• Add coverage for persisted workspace placement and background discovery.

Testing

• Not run.

[greptile-apps]

Greptile Summary

Captures the frontmost process while finalizing each snapshot so focus resolution and reconciliation use the latest application state.

• Routes the captured process identifier into focused-window resolution.
• Lets non-floating windows from the frontmost application activate and focus their persisted workspace.
• Adds coverage for persisted placement and background-window discovery behavior.

Confidence Score: 5/5

The PR appears safe to merge with no concrete blocking or non-blocking defects identified.

The updated snapshot timing, focused-process propagation, and workspace-following behavior are internally consistent with the stated policy and added test coverage.

Important Files Changed

Filename	Overview
Sources/DefiMacOS/MacOSPlatform+Snapshot.swift	Moves frontmost-process capture to snapshot finalization and supplies it to focused-window resolution.
Sources/DefiMacOS/SnapshotEngine.swift	Updates focused-window resolution to accept the snapshot’s captured frontmost process identifier.
Sources/DefiRuntime/WindowReconciliation.swift	Allows non-floating frontmost-app spawns to activate and focus their assigned workspace.
Tests/DefiRuntimeTests/BackgroundWindowDiscoveryTests.swift	Distinguishes frontmost and background processes in discovery coverage.
Tests/DefiRuntimeTests/PlacementPreferencesTests.swift	Verifies that a frontmost-app spawn follows persisted workspace placement and becomes selected.

Sequence Diagram

sequenceDiagram
    participant SE as SnapshotEngine
    participant WS as NSWorkspace
    participant AX as Accessibility API
    participant WR as Window Reconciliation
    SE->>WS: Read frontmost process at finalization
    SE->>AX: Resolve focused window for process
    SE->>WR: Reconcile snapshot and process ID
    WR->>WR: Place new window in assigned workspace
    WR->>WR: Focus non-floating frontmost-app spawn

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