Initial support for application specific overrides.

internal/applicationoverrides/override.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// Package applicationoverrides defines built-in, event-loop-owned application
+// adapters. Adapters interpret snapshots; they never own devices or persistence.
+package applicationoverrides
+
+import (
+	"git.stormux.org/storm/fenrir/internal/command"
+	"git.stormux.org/storm/fenrir/internal/config"
+	"git.stormux.org/storm/fenrir/internal/presentation"
+	"git.stormux.org/storm/fenrir/internal/screen"
+)
+
+type Region struct {
+	Name, Text string
+}
+
+// Frame supplements the ordinary reader. OwnsPresentation replaces generic
+// automatic diffs, never raw review/copy or typing echo. Updates are independent
+// of focus: a focus change must not swallow a simultaneous chat message.
+type Frame struct {
+	Recognized, OwnsPresentation, FocusChanged bool
+	Focus, Updates                             []presentation.Message
+	Regions                                    []Region
+	// Input limits typing/deletion echo to an application's actual input field.
+	Input *screen.Region
+}
+
+type Adapter interface {
+	Name() string
+	Configure(*config.Settings)
+	Observe(screen.Snapshot) Frame
+	Command(command.ID) (presentation.CommandResult, bool)
+	// Reset forgets screen-derived baselines after suspension or layout changes.
+	Reset()
+	Close()
+}