docs(release): prepare the 0.6.1 changelog and announcement

apps/marketing/src/content/changelog/v0.6.1.md

@@ -0,0 +1,22 @@
+---
+version: 0.6.1
+date: 2026-10-09
+title: General Chats and folders without Git finish their turns again
+summary: Turns in General Chats and in project folders without Git now end when the agent finishes. Finished chats show as unread again, and your next message no longer looks like it's waiting on the agent.
+githubRelease: https://github.com/Threadlines/threadlines/releases/tag/v0.6.1
+highlights:
+  - title: General Chats finish their turns
+    description: A finished turn in a General Chat stayed marked as working. Your next message looked like it was waiting on the agent, and the General Chats line in the sidebar dropped the chat instead of showing it as unread. Turns now end when the agent finishes. A chat that's stuck right now settles after its next message.
+    evidence:
+      - b0c311e0
+  - title: Projects without Git work fully again
+    description: The same fix covers any project folder that isn't a Git repository, and turns whose Git snapshot fails. Compacting a conversation works again, and threads an agent started no longer look busy after they finish.
+    evidence:
+      - b0c311e0
+social: |-
+  Threadlines v0.6.1 is out 🧵
+
+  Turns in General Chats and in folders without Git finish again, so finished chats show as unread and your next message doesn't look stuck.
+
+  Release notes: https://github.com/Threadlines/threadlines/releases/tag/v0.6.1
+---