chore: Add changelog note about mechanism changes

CHANGELOG.md

@@ -2,6 +2,45 @@
 
 ## Unreleased
 
+### Important Changes
+
+- **ref: Add and Adjust error event `mechanism` values**
+
+  This release includes a variety of changes aimed at setting the `mechanism` field on errors captured automatically by the Sentry SDKs. [The intention](https://github.com/getsentry/sentry-javascript/issues/17212) is to clearly mark which instrumentation captured an error. In addition, some instrumentations previously did not yet annotate the error as handled or unhandled which this series of PRs corrects as well.
+
+  <details>
+  <summary> Relevant PRs </summary>
+
+  <br/>
+
+  Released in `10.12.0`:
+  - ref(angular): Adjust ErrorHandler event mechanism ([#17608](https://github.com/getsentry/sentry-javascript/pull/17608))
+  - ref(astro): Adjust `mechanism` on error events captured by astro middleware ([#17613](https://github.com/getsentry/sentry-javascript/pull/17613))
+  - ref(aws-severless): Slightly adjust aws-serverless mechanism type ([#17614](https://github.com/getsentry/sentry-javascript/pull/17614))
+  - ref(bun): Adjust `mechanism` of errors captured in Bun.serve ([#17616](https://github.com/getsentry/sentry-javascript/pull/17616))
+  - ref(core): Adjust MCP server error event `mechanism` ([#17622](https://github.com/getsentry/sentry-javascript/pull/17622))
+  - ref(core): Simplify `linkedErrors` mechanism logic ([#17600](https://github.com/getsentry/sentry-javascript/pull/17600))
+  - ref(nextjs): Set more specific event `mechanism`s ([#17543](https://github.com/getsentry/sentry-javascript/pull/17543))
+  - ref(node-core): Add `mechanism` to cron instrumentations ([#17544](https://github.com/getsentry/sentry-javascript/pull/17544))
+  - ref(node-core): Add more specific `mechanism.type` to worker thread errors from `childProcessIntegration` ([#17578](https://github.com/getsentry/sentry-javascript/pull/17578))
+  - ref(node): Add mechanism to errors captured via connect and koa integrations ([#17579](https://github.com/getsentry/sentry-javascript/pull/17579))
+  - ref(nuxt): Add and adjust `mechanism.type` in error events ([#17599](https://github.com/getsentry/sentry-javascript/pull/17599))
+  - ref(react): Add mechanism to `reactErrorHandler` and adjust mechanism in `ErrorBoundary` ([#17602](https://github.com/getsentry/sentry-javascript/pull/17602))
+  - ref(remix): Adjust event mechanism of `captureRemixServerException` ([#17629](https://github.com/getsentry/sentry-javascript/pull/17629))
+  - ref(replay-internal): Add mechanism to error caught by `replayIntegration` in debug mode ([#17606](https://github.com/getsentry/sentry-javascript/pull/17606))
+  - ref(solid): Add `mechanism` to error captured by `withSentryErrorBoundary` ([#17607](https://github.com/getsentry/sentry-javascript/pull/17607))
+
+  <br/>
+
+  Released in `10.11.0`:
+  - ref(browser): Add more specific `mechanism.type` to errors captured by `httpClientIntegration` ([#17254](https://github.com/getsentry/sentry-javascript/pull/17254))
+  - ref(browser): Set more descriptive `mechanism.type` in `browserApiErrorsIntergation` ([#17251](https://github.com/getsentry/sentry-javascript/pull/17251))
+  - ref(core): Add `mechanism.type` to `trpcMiddleware` errors ([#17287](https://github.com/getsentry/sentry-javascript/pull/17287))
+  - ref(core): Add more specific event `mechanism`s and span origins to `openAiIntegration` ([#17288](https://github.com/getsentry/sentry-javascript/pull/17288))
+  - ref(nestjs): Add `mechanism` to captured errors ([#17312](https://github.com/getsentry/sentry-javascript/pull/17312))
+
+</details>
+
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
 ### Important Changes