Update CHANGELOG.md for 16.5.0.rc.0

[justin808]

Summary

• Stamp ### [16.5.0.rc.0] version header with today's date
• Add 10 new changelog entries for PRs merged since v16.4.0
• Fix incomplete PR 2818 entry (missing author link)

New entries added

Added:

• create-react-on-rails-app --pro support (PR 2818)
• Global prerender env override REACT_ON_RAILS_PRERENDER_OVERRIDE (PR 2816)
• react_on_rails:sync_versions rake task (PR 2797)
• Pro/RSC setup checks in react_on_rails:doctor (PR 2674)

Changed:

• [Pro] Canonical env var for worker count is now RENDERER_WORKERS_COUNT (PR 2611)

Improved:

• Smoother create-react-on-rails-app and install generator flows (PR 2650)
• Pro upgrade hint after install (PR 2642)

Fixed:

• Preserve runtime env vars across Bundler.with_unbundled_env (PR 2836)
• Fix doctor prerender check and ExecJS display for Pro/RSC apps (PR 2773)
• Fix doctor false positives for custom layouts (PR 2612)

Skipped PRs (not user-visible)

Docs-only: #2845, #2842, #2826, #2830, #2820, #2809, #2803, #2785, #2801, #2791, #2789, #2788, #2772, #2778, #2780, #2784, #2671, #2676, #2662, #2657, #2669
CI/internal tooling: #2825, #2817, #2819, #2812, #2815, #2810, #2808, #2807, #2634, #2798, #2761, #2760, #2658, #2639, #2667, #2656

Test plan

• Verified version header and diff links are correct
• Verified all entries follow changelog formatting conventions
• Verified file ends with newline
• After merge, run rake release to publish 16.5.0.rc.0

🤖 Generated with Claude Code

---

Note

Low Risk
Documentation-only change updating CHANGELOG.md with a new 16.5.0.rc.0 section and compare links; no runtime code is modified.

Overview
Adds a new 16.5.0.rc.0 (2026-03-25) section to CHANGELOG.md, consolidating recent PR entries under Added/Changed/Improved/Fixed and correcting the previously incomplete --pro CLI entry author attribution.

Updates the bottom compare links so [unreleased] now compares from v16.5.0.rc.0 and adds a link definition for [16.5.0.rc.0].

^{Written by Cursor Bugbot for commit 481a71c. This will update automatically on new commits. Configure here.}

Summary by CodeRabbit

Release Notes - v16.5.0.rc.0

• New Features

  • Added sync_versions task for streamlined version management
  • Expanded doctor checks for Pro and RSC support

• Improvements

  • Enhanced generator workflow and Pro upgrade guidance
  • Improved environment variable handling and preservation

• Bug Fixes

  • Fixed detection issues with doctor tools and ExecJS/prerender functionality

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 556c76b0-5813-43f6-8f09-d119a4f3be9b

📥 Commits

Reviewing files that changed from the base of the PR and between 2e490c5 and 481a71c.

📒 Files selected for processing (1)

• CHANGELOG.md

---

Walkthrough

A new release section for version 16.5.0.rc.0 was added to the changelog, containing reformatted existing entries and new items documenting improvements, fixes, and feature additions. Version comparison links were updated to reflect the new release as the unreleased base.

Changes

Cohort / File(s)	Summary
Changelog Release Update CHANGELOG.md	Added new release section 16.5.0.rc.0 with reformatted and expanded entries covering react_on_rails:sync_versions, expanded doctor checks, worker-count env var canonicalization, generator improvements, and various bug fixes. Updated version comparison links for [unreleased] and added new [16.5.0.rc.0] link.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A version blooms with hopeful light,
16.5.0.rc.0 marks progress bright,
New features, fixes, all in place,
The changelog updates keep the pace! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and directly summarizes the main change: updating the CHANGELOG for release version 16.5.0.rc.0.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jg/update-changelog-rc

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[greptile-apps]

Greptile Summary

This is a changelog-only PR that stamps the [16.5.0.rc.0] - 2026-03-25 version header, moves the two previously unreleased entries into it, adds eight more user-visible entries (covering the Added/Changed/Improved/Fixed categories), fixes the missing author link on the PR 2818 entry, and updates the [unreleased] and [16.5.0.rc.0] diff-comparison URLs at the bottom of the file.

• All 10 new entries are properly attributed with author links and valid PR URLs.
• The [Unreleased] section is left empty but present, which is the standard keepachangelog pattern.
• The [unreleased] comparison link now correctly targets v16.5.0.rc.0...main; the link will resolve once rake release creates the v16.5.0.rc.0 git tag (noted as a post-merge step in the test plan).
• The new [16.5.0.rc.0] link correctly compares v16.4.0...v16.5.0.rc.0.
• Entry formatting (bold feature name, inline PR link, inline author link) is consistent with the surrounding changelog style.

Confidence Score: 5/5

• This is a documentation-only CHANGELOG update with no code changes; safe to merge immediately.
• All entries are well-formed and correctly attributed. The only "live" dependency — the v16.5.0.rc.0 git tag — is intentionally deferred to the post-merge rake release step, which is standard practice for this repo. No logic, tests, or runtime behaviour is affected.
• No files require special attention.

Important Files Changed

Filename	Overview
CHANGELOG.md	Adds [16.5.0.rc.0] - 2026-03-25 version block with 10 new user-visible entries (Added/Changed/Improved/Fixed), fixes the incomplete PR 2818 author link, and updates the diff-comparison links at the bottom of the file.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    U["[Unreleased]<br/>compare: v16.5.0.rc.0...main"]
    RC["[16.5.0.rc.0] - 2026-03-25<br/>compare: v16.4.0...v16.5.0.rc.0"]
    V164["[16.4.0] - 2026-03-16"]

    U --> RC
    RC --> V164

    subgraph RC_entries["16.5.0.rc.0 entries"]
        A1["Added: --pro CLI flag (PR 2818)"]
        A2["Added: REACT_ON_RAILS_PRERENDER_OVERRIDE (PR 2816)"]
        A3["Added: react_on_rails:sync_versions task (PR 2797)"]
        A4["Added: Pro/RSC doctor checks (PR 2674)"]
        C1["Changed: RENDERER_WORKERS_COUNT env var (PR 2611)"]
        I1["Improved: create-react-on-rails-app flow (PR 2650)"]
        I2["Improved: Pro upgrade hint after install (PR 2642)"]
        F1["Fixed: env vars across Bundler.with_unbundled_env (PR 2836)"]
        F2["Fixed: doctor prerender/ExecJS for Pro/RSC (PR 2773)"]
        F3["Fixed: doctor false positives for custom layouts (PR 2612)"]
    end

    RC --> RC_entries

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_{Reviews (1): Last reviewed commit: "Update CHANGELOG.md for 16.5.0.rc.0" | Re-trigger Greptile}

[claude]

Review: CHANGELOG update for 16.5.0.rc.0

This is a clean, documentation-only change. Overall LGTM.

Observations

Version format is correct for the release tooling.
The gem version 16.5.0.rc.0 and VersionSyntaxConverter#rubygem_to_npm correctly converts this to 16.5.0-rc.0 for npm, so both registries will receive properly formatted pre-release identifiers.

The [unreleased] compare link will be broken until the tag is created.
The link [unreleased]: .../compare/v16.5.0.rc.0...main references a tag that does not exist yet (version.rb still reads 16.4.0). This is intentional per the test plan (run rake release after merge), but the diff link will 404 until the tag is pushed.

version.rb and package.json are not updated here.
Both still read 16.4.0. Assuming rake release handles those bumps automatically — if not, version files will need a separate update before or alongside the release.

PR 2818 author attribution is correctly fixed.
The previously incomplete by (missing author link) is now by [justin808](https://github.com/justin808).

Formatting is consistent with the rest of the file — single-line entries, correct PR link format (no #), established #### Improved section, and correct **[Pro]** tagging for the worker-count env var change.