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/RuleSchedule.swift

@@ -76,7 +76,7 @@ struct RuleSchedule: Hashable, Sendable {
 }
 
 extension RuleSchedule {
-    /// "09:00" style label for a minutes-from-midnight value, matching the reference UI.
+    /// "09:00" style label for a minutes-from-midnight value.
     static func timeLabel(forMinutes minutes: Int) -> String {
         let clamped = ((minutes % (24 * 60)) + 24 * 60) % (24 * 60)
         return String(format: "%02d:%02d", clamped / 60, clamped % 60)