Add a changelog

[stixx]

Why

Release notes on GitHub are auto-generated PR titles. They say what merged, not what an upgrade requires — and 0.12.1 shipped two changes that can affect a working application:

• Two command classes resolving to the same route name now fail the container build. Without an operationId the name derives from the class short name, so Billing\CreateInvoiceCommand and Sales\CreateInvoiceCommand collide. A build that goes red here was already silently losing an endpoint, but nothing published says so.
• NelmioApiDocBundle must now be registered and configured, not merely installed.

Both are called out under an Upgrading heading in the 0.12.1 entry.

Contents

Keep a Changelog format, covering the full history from 0.1.0. Entries for 0.11.x and earlier are derived from the existing GitHub release notes; the 0.12.x entries are written from the diffs.

Also records why 0.12.3 exists — it is the same commit as 0.12.2, re-released under a new number because Packagist will not re-point a published version at a different commit. Without that note, two versions with identical content and a gap at 0.12.2 on Packagist looks like a mistake.

A note at the top flags that this is a 0.x package, so minors may break.

Linked from the README's documentation list.

Summary by CodeRabbit

• Documentation
  • Added a comprehensive changelog covering releases 00.1.0 through 00.12.3, including unreleased changes, upgrade notes, fixes, removals, and release comparisons.
  • Documented notable routing, configuration, duplicate-route, and API documentation setup changes.
  • Added a Changelog link to the README documentation section.

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• CHANGELOG.md

Walkthrough

Adds CHANGELOG.md with release history, upgrade notes, and GitHub links for versions 0.1.0 through 0.12.3. Adds a README link to the changelog.

Changes

Release history documentation

Layer / File(s)	Summary
Changelog content CHANGELOG.md	Adds Keep a Changelog and SemVer guidance, an Unreleased section, release notes for versions 0.5.0 through 0.12.3, and GitHub comparison and release links.
README changelog link README.md	Adds a link to CHANGELOG.md in the documentation links.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: 🔵 Low · up to 70a41

The changelog currently links 0.12.3 from 0.12.1, which repeats the 0.12.2 changes instead of showing the intended release delta. The PR is otherwise mergeable, with this bounded documentation correction requiring owner follow-up.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a changelog and linking it from the README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/changelog

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Actionable comments posted: 1

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Inline comments:
In `@CHANGELOG.md`:
- Line 198: Update the 0.12.3 comparison link in the changelog to use 0.12.2 as
its base, preserving the existing 0.12.3 release endpoint.

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• README.md

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[stixx]

Valid, fixed in 6c3dbf6.

The link now compares 0.12.2...0.12.3, matching the version this entry follows in the file. Worth noting the consequence, since it is unusual: both tags point at bcc7480, so that comparison renders empty. That is correct — 0.12.3 introduces no code over 0.12.2 — and it corroborates the entry's claim rather than undermining it.

The reason I had used 0.12.1 was that 0.12.2 does not exist on Packagist, so 0.12.1...0.12.3 is the delta a Composer user actually receives. Rather than pick one, the entry now states the comparison is empty by design and links 0.12.1...0.12.3 inline for anyone upgrading from Packagist. Both readings are served and neither link is a surprise.

Separately: 0.12.3 is already released, so merging this would otherwise imply a 0.12.4 containing nothing but the changelog. It is filed under Unreleased instead — merging does not require a tag, and the section carries it until there is something worth releasing alongside it.