quill: draft product announcement for batch export feature

wizard-work/quill/product-announcement-draft.md

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+Product Update: Batch Export & Team Sharing
+============================================
+
+Date: Wednesday, November 04, 2026
+To: beta-customers@stackchain.example
+From: product@stackchain.example
+Subject: [Beta] Export runs in bulk, share with teammates
+
+Dear Beta Customer,
+
+Starting today, you can export multiple runs at once and share project
+folders with teammates without re-sending invites every time.
+
+What changed
+------------
+- Batch export: select up to 500 runs and download a single zip.
+- Team sharing: project folders now inherit org membership.
+- Audit log: every export and share event is recorded in Settings > Logs.
+
+How to use it
+-------------
+1. Open any project.
+2. Use the new checkbox column in Runs to select targets.
+3. Click Export selected. The file arrives in Downloads as
+   `stackchain-export-YYYYMMDD.zip`.
+4. To share a folder, open Sharing and add your org role.
+
+Pricing note
+------------
+Batch export is included in Beta at no charge. After launch, it will
+require the Team tier. Existing Beta users keep access for 90 days past
+GA.
+
+Next steps
+----------
+- Try batch export on your next weekly run.
+- Add a teammate and confirm folder access.
+- Reply with feedback or bugs.
+
+Thanks,
+Product Team