docs: remove references to the source app and recording

Prepare for open-sourcing: scrub the prior-art attribution from the spec,
agent guide, and code comments so the project documents its own behavior.

- Reword RULES_FEATURE_SPEC.md to describe OpenAppLock's rules feature
  directly (drop the screen-recording source line and "as observed"/
  "not demoed"/"as shown" framing)
- Replace "the reference app/UI/style/defaults" comments and test names
  with direct descriptions of the behavior
- No behavior change; comments, docs, and @Test display names only

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Shared/RuleConfiguration.swift

@@ -26,8 +26,8 @@ enum RuleConfiguration: Hashable, Sendable {
         }
     }
 
-    /// The default configuration for a brand-new rule of the given kind, using
-    /// the reference app's defaults (9–5 schedule, 45m/day, 5 opens/day).
+    /// The default configuration for a brand-new rule of the given kind
+    /// (9–5 schedule, 45m/day, 5 opens/day).
     static func `default`(for kind: RuleKind) -> RuleConfiguration {
         switch kind {
         case .schedule: .schedule(ScheduleConfig())