Add release notes for December 2024 release (#5323)

Release notes for 2024 December

website/src/content/docs/docs/release-notes/release-2024-12-10.md

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+---
+title: 0.63 - December 2024
+releaseDate: 2024-12-10
+version: "0.63"
+---
+
+## Notable changes
+
+### Experimental: Improve Realm, Mutator, and Typekit implementations
+
+The compiler strongly binds a Realm and Typekit together, and changes mutators so that new types are cloned within the mutator's realm. The default Typekit now creates a default typekit realm for the current program, and a Typekit can be easily created to work in a specific Program or Realm as needed.
+
+### Enum-driven Visibility
+
+A new mechanism for visibility that defines valid visibility values in enums and provides tools for filtering types by visibility. A new `LifecycleVisibility` enum defines standard protocol-agnostic visibility values for operations that manage the lifecycle (creation, update, deletion) of a resource. More details on visibility enums are available [in website documentation](../language-basics/visibility.md)
+
+## Features
+
+### @typespec/compiler
+
+- [#4937](https://github.com/microsoft/typespec/pull/4937) Add mutateSubgraphWithNamespace as a separate API
+- [#4837](https://github.com/microsoft/typespec/pull/4837) Allow trailing delimiter in array values, tuple, decorator declaration, scalar initializer, etc.
+- [#5149](https://github.com/microsoft/typespec/pull/5149) Experimental: Improve Realm, Mutator, and Typekit implementations.
+
+- [#4825](https://github.com/microsoft/typespec/pull/4825) Adds support for enum-driven visibility in the compiler core.
+
+### @typespec/openapi3
+
+- [#5029](https://github.com/microsoft/typespec/pull/5029) Add support for `#deprecated` for OpenAPI3Parameter
+
+## Bug Fixes
+
+### @typespec/compiler
+
+- [#5252](https://github.com/microsoft/typespec/pull/5252) Added RegEx validation for @pattern and will throw warning for invalid RegEx string
+
+### @typespec/http
+
+- [#5016](https://github.com/microsoft/typespec/pull/5016) Uri template attributes were not extracted when parameter was explicitly mark with `@path` or `@query` as well
+
+### @typespec/http-server-csharp
+
+- [#4308](https://github.com/microsoft/typespec/issues/4308) Process sub-namespaces of a service
+- [#4998](https://github.com/microsoft/typespec/issues/4998) Handle void returnType
+- [#5000](https://github.com/microsoft/typespec/issues/5000) Handle tuple literals
+- [#5001](https://github.com/microsoft/typespec/issues/5001) Skip envelope types withpout properties
+- [#5024](https://github.com/microsoft/typespec/issues/5024) Literal type is not properly generated
+- [#5124](https://github.com/microsoft/typespec/issues/5124) Skip uninstantiated templates
+- [#5125](https://github.com/microsoft/typespec/issues/5125) Process operations outside interfaces
+- Handle nullable types and anonymous typesin all contexts
+- Add server-side numeric constraints for safeInt
+
+### @typespec/http-server-javascript
+
+- Add an additional check for the presence of a property before performing a bounds check on integer properties constrained to a range.
+- [5185](https://github.com/microsoft/typespec/issues/5185) Add logic to handle invalid identifier names (#5185)
+
+### @typespec/versioning
+
+- [#5262](https://github.com/microsoft/typespec/pull/5262) Fixes diagnostics for @typeChangedFrom to properly detect when an incompatible version is referenced inside of a template, union, or tuple.
+
+### @typespec/openapi3
+
+- [#5006](https://github.com/microsoft/typespec/pull/5006) Illegal characters in component keys
+- [#5274](https://github.com/microsoft/typespec/pull/5274) Added missing peer dependency "openapi-types"
+
+### @typespec/json-schema
+
+- [#5189](https://github.com/microsoft/typespec/pull/5189) Fixes crash that occurred when a template instantiation's template argument was a union that references a declaration.