feat(KB-055): merge feat-github-int into main

.changeset/add-ntfy-notifications.md

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+---
+"@dustinbyrne/kb": patch
+---
+
+Add ntfy.sh push notifications for task completion and failures
+
+Configure your ntfy.sh topic in Settings → Notifications to receive push notifications when:
+- Tasks complete and move to "in-review"
+- Tasks are merged to main (move to "done")
+- Tasks fail and need attention
+
+The ntfy topic is also included in task prompts when configured, making it easy for agents to send custom notifications during task execution.

.changeset/hide-done-tasks-list-view.md

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+---
+"@dustinbyrne/kb": patch
+---
+
+Add ability to hide done tasks in list view. The toggle persists in localStorage and helps declutter the view when many tasks are completed.