chore(release): v1.0.9 changelog, customer email + thumbnail artifacts (#331)

* chore(release): add v1.0.9 changelog, customer email, and thumbnail artifacts

* chore(release): rewrite v1.0.9 customer email as a webhook announcement

* chore(release): tighten v1.0.9 email around what people asked for

* chore(release): rewrite v1.0.9 email around webhook value

* chore(release): write a plain v1.0.9 webhook announcement email

* chore(release): close v1.0.9 email with a G2 review ask

releases/v1.0.9/changelog.md

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+## What's Changed
+* chore(release): v1.0.8 changelog, customer email + thumbnail artifacts, and /release copy rules by @paulocastellano in https://github.com/trypostit/trypost/pull/305
+* Make the test suite pass on MySQL by @jonto in https://github.com/trypostit/trypost/pull/307
+* Defuse links in X posts to avoid the link-post fee by @paulocastellano in https://github.com/trypostit/trypost/pull/308
+* Carry signup attribution into the Stripe subscription by @paulocastellano in https://github.com/trypostit/trypost/pull/322
+* Send the ad click IDs to Stripe alongside the UTM parameters by @paulocastellano in https://github.com/trypostit/trypost/pull/323
+* Visible Terms and Privacy links on the auth screens by @gynsus in https://github.com/trypostit/trypost/pull/317
+* Fall back to display name when a published-post email has no username by @paulocastellano in https://github.com/trypostit/trypost/pull/325
+* perf(horizon): skip queues for platforms that are disabled by @maciejdzierzek in https://github.com/trypostit/trypost/pull/321
+* Add workspace webhooks and drop the unused automation webhook node by @paulocastellano in https://github.com/trypostit/trypost/pull/326
+* Slim webhook log broadcasts to fix Reverb payload-too-large by @paulocastellano in https://github.com/trypostit/trypost/pull/329
+* Expose workspace webhooks through the API and MCP by @paulocastellano in https://github.com/trypostit/trypost/pull/330
+
+
+## New Contributors
+* @gynsus made their first contribution in https://github.com/trypostit/trypost/pull/317
+* @maciejdzierzek made their first contribution in https://github.com/trypostit/trypost/pull/321
+
+**Full Changelog**: https://github.com/trypostit/trypost/compare/v1.0.8...v1.0.9

releases/v1.0.9/email.md

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+---
+subject: "Changelog v1.0.9 — Introducing webhooks 🎉"
+---
+
+# Changelog v1.0.9 — Introducing webhooks 🎉
+
+By TryPost Product Team • [Release v1.0.9](https://github.com/trypostit/trypost/releases/tag/v1.0.9)
+
+Hello! Welcome to this week's update. Here's what's new in TryPost.
+
+## Introducing webhooks
+
+You can now connect TryPost to external services like n8n, Zapier, Make, or your own endpoint, and build your own automations.
+
+When something happens to a post, we send the event to the URL you choose. You can subscribe to:
+
+- Post created
+- Post scheduled
+- Post unscheduled
+- Post published
+- Post published on some networks
+- Post failed
+- Post deleted
+
+If you're enjoying TryPost, consider leaving a review on [G2](https://www.g2.com/products/trypost/). We really appreciate the feedback.
+
+Cheers,
+Paulo from TryPost.it
+
+---
+
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