Clarify unified release guidance

Document the Node-only unstable channel and align changelog examples with the six-language release policy.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 01a9d0e3-0073-48f2-afae-de0398986669

Author: stephentoub

.github/workflows/release-changelog.lock.yml

@@ -147,6 +147,8 @@ While `session.rpc.models.setModel()` already worked, there is now a convenience
 - C#: `session.SetModel("gpt-4o")`
 - Python: `session.set_model("gpt-4o")`
 - Go: `session.SetModel("gpt-4o")`
+- Java: `session.setModel("gpt-4o").get()`
+- Rust: `session.set_model("gpt-4o", None).await?`
 
 ### Other changes
 
@@ -164,7 +166,7 @@ While `session.rpc.models.setModel()` already worked, there is now a convenience
 **Key rules visible in the example:**
 
 - Highlighted features get their own `### Feature:` heading, a short description, and code snippets
-- Code snippets are TypeScript and C# primarily; Go/Python only when listing one-liner equivalents or when meaningfully different
+- Code snippets use whichever of TypeScript, C#, Go, Python, Java, and Rust best illustrate the change; list all affected languages when showing equivalents
 - The `### Other changes` section is a flat bulleted list with lowercase `bugfix:` / `feature:` / `improvement:` prefixes
 - PR numbers are linked inline, not at the end with author attribution (keep it clean)
 

.github/workflows/release-changelog.md

@@ -15,9 +15,11 @@ alongside the other SDKs. There is no Rust-specific release workflow.
      prerelease version requirement to install it.
    - `unstable` — skipped for Rust (Cargo doesn't have a clean
      equivalent of npm's `unstable` dist-tag).
-4. The workflow publishes all SDKs at the shared computed version,
-   tags `rust/vX.Y.Z` for source traceability, and creates one combined
-   `vX.Y.Z` GitHub Release.
+4. For `latest` and `prerelease`, the workflow publishes all SDKs at
+   the shared computed version, tags `rust/vX.Y.Z` for source
+   traceability, and creates one combined `vX.Y.Z` GitHub Release.
+   The `unstable` channel publishes only the Node.js SDK and does not
+   create a GitHub Release.
 
 ## Version, tag, and release notes