docs(changelog): prepare release notes for v2.1.1-ekaterinburg

[nanotaboada]

Summary

• Promotes all [Unreleased] entries to ## [2.1.1 - Ekaterinburg Arena] - 2026-04-12
• Adds a fresh empty ## [Unreleased] section for future work
• Updates compare links: [unreleased] now points to v2.1.1-ekaterinburg...HEAD; adds [2.1.1 - ekaterinburg] link

What's in this release

Added: CD pipeline improvements (test job isolation, linux/arm64, image attestation), ADR 0013 (testing strategy), repository and web application integration tests, additional validator tests, and 12 ADRs documenting architectural decisions.

Changed: Rate limiting exemption for /health, middleware pipeline ordering, EF Core MigrateAsync() at startup replacing pre-seeded DB, Alpine runtime image (113 MB → 74 MB), test naming conventions normalized, CD workflow tag reachability check.

Fixed: GET /players returns 200 OK with empty list instead of 404; AutoMapper profile explicitly ignores Id source member.

Test plan

• dotnet build --configuration Release — passed
• dotnet test --settings .runsettings — 64/64 passed
• dotnet csharpier --check . — no issues

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation

  • Added a new 2.1.1 release entry with an "Added" subsection and populated release notes.
  • Inserted empty "Changed", "Fixed", and "Removed" subsections under Unreleased for future entries.
  • Updated changelog comparison links to include the new 2.1.1 release.

• Chores

  • Adjusted changelog structure and links to reflect the 2.1.1 release.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 6a5e9088-ce1e-487e-8b69-36078d5ea8fd

📥 Commits

Reviewing files that changed from the base of the PR and between e17ad7d and 9650edd.

📒 Files selected for processing (1)

• CHANGELOG.md

✅ Files skipped from review due to trivial changes (1)

• CHANGELOG.md

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Walkthrough

Updated CHANGELOG.md: added a new release section for v2.1.1 (ekaterinburg) dated 2026-04-12 with an ### Added subsection, added empty ### Changed, ### Fixed, and ### Removed headings under [Unreleased], and updated bottom comparison links to reference v2.1.1-ekaterinburg.

Changes

Cohort / File(s)	Summary
Changelog Updates CHANGELOG.md	Added ## [2.1.1 - ekaterinburg] - 2026-04-12 with ### Added entries; inserted empty ### Changed, ### Fixed, ### Removed under [Unreleased]; updated comparison links so [unreleased] compares from v2.1.1-ekaterinburg...HEAD and added [2.1.1 - ekaterinburg] link comparing v2.1.0-dusseldorf...v2.1.1-ekaterinburg.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• chore(changelog): prepare CHANGELOG for 2.0.0 - centenario #422: Similar promotion of Unreleased entries into a new release section and adjustments to comparison links.
• docs: standardize release workflow and improve documentation quality #369: Updates to CHANGELOG release headers and comparison links consistent with this change.
• docs: prepare changelog for v2.1.0-dusseldorf release #438: Another PR that promotes Unreleased to a release entry and updates version comparison links.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows Conventional Commits format with 'docs:' prefix, is descriptive and specific about changelog updates for v2.1.1-ekaterinburg, and is 62 characters (under 80 limit).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v2.1.1-ekaterinburg

• 🛠️ sync documentation: Commit on current branch
• 🛠️ sync documentation: Create PR
• 🛠️ enforce http error handling: Commit on current branch
• 🛠️ enforce http error handling: Create PR
• 🛠️ idiomatic review: Commit on current branch
• 🛠️ idiomatic review: Create PR
• 🛠️ verify api contract: Commit on current branch
• 🛠️ verify api contract: Create PR

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@CHANGELOG.md`:
- Line 55: Change the release header string "## [2.1.1 - Ekaterinburg Arena] -
2026-04-12" to match the link reference and established pattern by using the
lowercase stadium slug "ekaterinburg" (i.e., update to "## [2.1.1 -
ekaterinburg] - 2026-04-12"); ensure the header exactly matches the link
reference `[2.1.1 - ekaterinburg]` so markdown links resolve and follow the
existing lowercase stadium naming convention.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 1a18f0ad-addf-46b4-a389-4eb3a45c494e

📥 Commits

Reviewing files that changed from the base of the PR and between 2afc5e5 and e17ad7d.

📒 Files selected for processing (1)

• CHANGELOG.md

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud