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+<!--
+A new scriv changelog fragment.
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+Uncomment the section that is right (remove the HTML comment wrapper).
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+
+<!--
+### Removed
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+- A bullet item for the Removed category.
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+-->
+### Added
+
+- Added a linter warning for whenever there are networks from both testnet and mainnet.
+- Forbid sending contracts to Marlowe Runner when networks mismatch.
+
+<!--
+### Changed
+
+- A bullet item for the Changed category.
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+-->
+<!--
+### Deprecated
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+- A bullet item for the Deprecated category.
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+<!--
+### Fixed
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+- A bullet item for the Fixed category.
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+<!--
+### Security
+
+- A bullet item for the Security category.
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+-->