Update CHANGELOG.md unreleased section (#3077)

### Summary

Adds missing changelog entries to the `[Unreleased]` section for PRs
merged since `v16.6.0.rc.0`. Analyzed 19 commits on `origin/main` since
the last tag, identified 1 missing user-visible PR (#3069), and skipped
10 non-user-visible PRs (docs, tests, internal refactors).

**New entries added:**
- **Added**: `[Pro] Configurable HTTP keep-alive timeout for node
renderer connections` (PR #3069)
- **Fixed**: `[Pro] Fixed SSR failures from stale persistent HTTP/2
connections` (PR #3069)

**Entries already present** (added in prior changelog updates): PRs
#2834, #2881, #2918, #2921, #2923, #2932, #3063, #3068, #3070.

**Skipped** (not user-visible): #2893 (docs), #2916 (docs), #2922 (test
fix), #2923 (test fix), #2925 (internal refactor), #3064 (docs), #3065
(docs), #3066 (docs), #3067 (docs), #3072 (docs).

### Pull Request checklist

- [x] ~Add/update test to cover these changes~
- [x] ~Update documentation~
- [x] Update CHANGELOG file

### Other Information

No code changes — CHANGELOG.md only.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk because this PR only changes documentation (`CHANGELOG.md`)
and does not modify runtime code.
> 
> **Overview**
> Updates `CHANGELOG.md` *[Unreleased]* to include missing Pro release
notes for PR `#3069`, documenting the new
`renderer_http_keep_alive_timeout` config and the associated fix for SSR
failures from stale persistent HTTP/2 connections to the node renderer.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
8d1a480. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Interactive mode selection prompt for CLI tool when no explicit mode
is specified
* Configurable keep-alive timeout setting for Pro users (default 30
seconds)

* **Bug Fixes**
  * Enhanced validation and error handling for invalid request payloads
  * Improved template literal handling in code generation
  * Better HTTP connection stability with enhanced diagnostic messaging

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: justin808

CHANGELOG.md

@@ -33,17 +33,22 @@ After a release, run `/update-changelog` in Claude Code to analyze commits, writ
 #### Added
 
 - **[Pro]** **Auto-resolve renderer password from ENV**: `setup_renderer_password` now falls back to `ENV["RENDERER_PASSWORD"]` when neither `config.renderer_password` nor a URL-embedded password is set, aligning Rails-side behavior with the Node Renderer defaults. Blank values (`nil` or `""`) are treated identically and fall through the full resolution chain: config → URL → ENV. [PR 2921](https://github.com/shakacode/react_on_rails/pull/2921) by [justin808](https://github.com/justin808).
+- **Interactive mode prompt for `create-react-on-rails-app`**: Running `npx create-react-on-rails-app` without `--pro` or `--rsc` now shows an interactive prompt to choose between Standard, Pro, and RSC modes (default: RSC recommended). Explicit flags skip the prompt, and non-interactive environments fall back to standard mode automatically. [PR 3063](https://github.com/shakacode/react_on_rails/pull/3063) by [justin808](https://github.com/justin808).
+- **[Pro] Configurable HTTP keep-alive timeout for node renderer connections**: Added `renderer_http_keep_alive_timeout` configuration option (default: 30s) to control how long idle persistent HTTP/2 connections to the node renderer are kept alive, preventing SSR failures from stale connections. [PR 3069](https://github.com/shakacode/react_on_rails/pull/3069) by [justin808](https://github.com/justin808).
 
 #### Improved
 
 - **Doctor enforces strict version constraints**: `react_on_rails:doctor` now escalates non-exact gem and npm version specs (`^`, `~`, `>=`) from warnings to errors, matching the runtime VersionChecker behavior. Wildcard checks now also cover Pro packages (`react-on-rails-pro`, `react_on_rails_pro`). [PR 3070](https://github.com/shakacode/react_on_rails/pull/3070) by [justin808](https://github.com/justin808).
 - **Error messages recommend doctor**: Runtime version-check crashes, configuration validation errors, and autobundling errors now suggest running `bundle exec rake react_on_rails:doctor` for diagnostics and `bundle exec rake react_on_rails:sync_versions WRITE=true` to fix version mismatches. [PR 3070](https://github.com/shakacode/react_on_rails/pull/3070) by [justin808](https://github.com/justin808).
 - **`sync_versions` handles range specs**: Version ranges like `^16.5.0`, `~16.5.0`, and `>=16.5.0` are now parsed and rewritten to the exact expected version instead of being skipped as unsupported. When `FIX=true` is set, doctor auto-runs `sync_versions` to fix detected mismatches. [PR 3070](https://github.com/shakacode/react_on_rails/pull/3070) by [justin808](https://github.com/justin808).
+- **[Pro] Improved node renderer error messages for malformed render requests**: Added early validation for missing or invalid `renderingRequest` payloads on the render endpoint, returning actionable 400 messages that include received type, body keys, and likely causes (truncation, malformed multipart, content-length mismatch). [PR 3068](https://github.com/shakacode/react_on_rails/pull/3068) by [justin808](https://github.com/justin808).
 
 #### Fixed
 
 - **[Pro]** **Fixed TanStack Router SSR hydration mismatches in the async path**: Client hydration now restores server match data before first render, uses `RouterProvider` directly to match the server-rendered tree, and stops the post-hydration load when a custom `router.options.hydrate` callback fails instead of continuing with partially hydrated client state. [PR 2932](https://github.com/shakacode/react_on_rails/pull/2932) by [justin808](https://github.com/justin808).
 - **[Pro] Fixed infinite fork loop when node renderer worker fails to bind port**: When a worker failed during `app.listen()` (e.g., `EADDRINUSE`), the master previously reforked unconditionally, causing an infinite fork/crash loop that consumed CPU and filled logs. Workers now send a `WORKER_STARTUP_FAILURE` IPC message to the master before exiting; the master sets an abort flag and exits with a clear error message instead of reforking. Scheduled restarts and runtime crashes continue to refork as before. [PR 2881](https://github.com/shakacode/react_on_rails/pull/2881) by [justin808](https://github.com/justin808).
+- **[Pro] Fixed Pro generator multiline and template-literal rewrites**: The Pro install generator now correctly handles multiline non-parenthesized `gem "react_on_rails"` declarations while preserving trailing options, and correctly rewrites module specifiers around template literals by preserving escaped sequences and detecting multiline template-literal starts after a closed inline template. [PR 2918](https://github.com/shakacode/react_on_rails/pull/2918) by [justin808](https://github.com/justin808).
+- **[Pro] Fixed SSR failures from stale persistent HTTP/2 connections to the node renderer**: When idle connections became stale (closed by the node renderer but still considered active by the Ruby side), render requests could be truncated mid-flight, producing confusing `FST_ERR_CTP_INVALID_CONTENT_LENGTH` and "INVALID NIL or NULL result for rendering" errors. The new `renderer_http_keep_alive_timeout` config (default: 30s) prevents this by closing idle connections before they go stale. Content-Length mismatches now produce specific diagnostic messages instead of generic errors, and sensitive field names are filtered from diagnostic output. Fixes [Issue 3071](https://github.com/shakacode/react_on_rails/issues/3071). [PR 3069](https://github.com/shakacode/react_on_rails/pull/3069) by [justin808](https://github.com/justin808).
 
 ### [16.6.0.rc.0] - 2026-04-01