Consolidate beta releases into v16.2.0.beta.8

[justin808]

Summary

Consolidated all beta versions (beta.4 through beta.8) into a single v16.2.0.beta.8 changelog entry with proper date (2025-11-16). Added missing user-visible changes from PRs 2010, 2015, 2021, 2023, and 2039.

Changes

• Moved PR 2039 (Generator Configuration Modernization) from Unreleased to v16.2.0.beta.8/Changed section
• Added PR 2010: Doctor checks for :async loading strategy in Added section
• Added PR 2015: Concurrent streaming performance improvements in new Improved section
• Added PR 2021 & 2023: Bug fixes for shakapacker template and bin/dev --verbose in Fixed section
• Updated version diff links to properly reference v16.2.0.beta.8

Summary by CodeRabbit

• New Features

  • Doctor tool now includes diagnostic checks for non-Pro users using :async loading strategy, with upgrade guidance
  • Added --verbose flag support to bin/dev command

• Improved

  • Enhanced concurrent streaming performance with new async approach
  • Shakapacker template configuration now disables slow development warnings by default

• Chores

  • Updated to version v16.2.0.beta.8
  • Generator configuration defaults modernized for new applications

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The CHANGELOG.md is updated to document version 16.2.0.beta.8 with entries for new Doctor checks for async loading strategy, generator configuration modernization, bin/dev verbose option support, Shakapacker template configuration updates, and concurrent streaming performance improvements.

Changes

Cohort / File(s)	Change Summary
Changelog Version Update CHANGELOG.md	Updated version header from 16.2.0.beta.4 to 16.2.0.beta.8; added feature entries for Doctor async loading checks, generator config defaults, bin/dev verbose flag, Shakapacker template config, and concurrent streaming; reorganized section headers; updated version links and references

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Single file modified containing documentation-only changes
• No logic alterations, test updates, or public API modifications
• Straightforward changelog entries with link updates

Possibly related PRs

• docs: Improve file-system-based bundle generation guide #1766: Shares the auto_load_bundle generator configuration feature documented in this changelog entry.
• Polish configuration error message and add test comment #1976: Related through loading-strategy behavior changes; Doctor checks documentation aligns with preference for :defer over :sync in component loading configuration.

Suggested labels

review-needed

Suggested reviewers

• alexeyr-ci2

Poem

🐰 A changelog grows with features new,
Beta eight brings async checks so true,
Generators dance, verbosity flows,
Progress blooms where each update goes! ✨

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch justin808/consolidate-beta-changelog

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 37ddafe and d412d32.

📒 Files selected for processing (1)

• CHANGELOG.md (5 hunks)

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