Archive demo-activity-bot, pg-boss-background-jobs, configurable-demo-persona

Fold completed deltas into main specs (activity-feed, route-management,
infrastructure, planner-session), add new background-jobs and
demo-activity-bot capability specs, and move the three change dirs to
openspec/changes/archive/.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

openspec/specs/route-management/spec.md

@@ -130,3 +130,18 @@ Any listing that exposes routes beyond the owner's own dashboard SHALL only incl
 - **WHEN** a logged-in user views their own routes list at `/routes`
 - **THEN** the list includes all of their own routes regardless of visibility
 
+### Requirement: Synthetic route flag
+The Journal SHALL persist a `synthetic` boolean on every route so automated / demo content can be distinguished from user-created content.
+
+#### Scenario: User-created routes default to non-synthetic
+- **WHEN** a route is created through any user-facing flow (New Route, GPX import, Planner handoff)
+- **THEN** the route row is persisted with `synthetic = false`
+
+#### Scenario: Bot inserts flag their rows as synthetic
+- **WHEN** the demo-activity-bot inserts a route
+- **THEN** the row is persisted with `synthetic = true`
+
+#### Scenario: Synthetic flag is not user-editable
+- **WHEN** a route owner edits a route via any user-facing action
+- **THEN** the stored `synthetic` value is not changed by the edit
+