Ship the 0.8.0 first-hour and campaign milestone

Add the campaign shell, pause-safe checkpoint resume, post-shift campaign
continue, confirmed campaign reset, difficulty presets, searchable Help,
content-matrix validation, recovery events, contextual dialogue, policy/debrief
context and eligible-event previews. Extend persistence with atomic separate
files and add campaign/checkpoint/tutorial smokes. Headless 247/247, Python
94/94, tutorial/campaign/session/scenario smokes green.

docs/getting-started.md

@@ -61,6 +61,9 @@ godot --headless --path . --script res://src/test/smoke_scenario_content.gd
 
 # Tutorial smoke (windowed): completion, replay and skip; isolated user data
 XDG_DATA_HOME=/tmp/gigline-tutorial godot --path . --fixed-fps 60 --script res://src/test/smoke_tutorial.gd -- --tutorial
+
+# Campaign/checkpoint smoke (windowed): resume, review continue, help; isolated data
+XDG_DATA_HOME=/tmp/gigline-campaign godot --path . --fixed-fps 60 --script res://src/test/smoke_campaign.gd
 ```
 
 The unit test runner is the project's own lightweight harness (no editor plugin required) so CI can run it without the editor.