chore: update User-Agent header placeholder for SDK versioning

fern-api[bot] · web-flow · commit 070a0ff21f91 · 2026-07-18T00:22:43.000Z
Replace the hardcoded version string in the User-Agent header with the
standard Fern version placeholder. This ensures the SDK version is
injected correctly during the release pipeline rather than being
statically embedded in source.

Key changes:
- Update `User-Agent` header value from `vapi_server_sdk/2.0.0` to `vapi_server_sdk/0.0.0-fern-placeholder`
- Add `.fern/replay.lock`, `.fern/replay.yml`, and `.gitattributes` to `.fernignore`

🌿 Generated with Fern
diff --git a/changelog.md b/changelog.md
@@ -1,3 +1,5 @@
+## [2.0.1] - 2026-07-18
+
 ## 2.0.0 - 2026-06-24
 ### Breaking Changes
 * **`CartesiaExperimentalControlsSpeedZero`** has been removed and replaced by **`CartesiaSpeedControlZero`**. Update any imports or type annotations referencing `CartesiaExperimentalControlsSpeedZero` to use `CartesiaSpeedControlZero` instead.

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+## [2.0.1] - 2026-07-18`
	`2`	`+`
`1`	`3`	`## 2.0.0 - 2026-06-24`
`2`	`4`	`### Breaking Changes`
`3`	`5`	* `CartesiaExperimentalControlsSpeedZero` has been removed and replaced by `CartesiaSpeedControlZero`. Update any imports or type annotations referencing `CartesiaExperimentalControlsSpeedZero` to use `CartesiaSpeedControlZero` instead.