Upgrade Unity versions used to run tests on CI (Unity 6.5/ test-framework v1.7.0)

[nowsprinting]

Summary

• Add Unity 6.5 (6000.5.1f1) to the CI test matrix
• Upgrade several packages and fix deprecated API usage introduced by Unity 6.5
• Fix compile error on Unity 6.5: guard Is.BinarySerializable example with #if !ENABLE_UTF_1_7

Changes

CI

• Add 6000.5.1f1 to the unityVersion matrix

Package upgrades

• com.cysharp.unitask: 2.5.x → 2.5.11
• com.nowsprinting.create-script-folders-with-tests: 1.3.x → 1.4.0
• com.nowsprinting.test-helper: 1.4.x → 1.5.0
• com.nowsprinting.test-helper.ui: 1.2.x → 1.3.0

Deprecated API fixes (Unity 6.4+, CS0618 as error)

• Treat CS0618 (obsolete) as a compile error (Default.globalconfig)
• Replace FindObjectOfType / FindObjectsOfType with #if UNITY_2022_3_OR_NEWER guards
• Replace FindFirstObjectByType with FindAnyObjectByType (obsolete in Unity 6.4)

Unity 6.5 / test-framework 1.7 compatibility

• Update UnityTestFrameworkVersionCheck test cases to cover Unity 6.5 (6000.5.0f1+)
• Add ENABLE_UTF_1_7 to APIExamples.Tests.asmdef versionDefines
• Guard BinarySerializableConstraint example with #if !ENABLE_UTF_1_7

Misc

• Add Claude Code settings (.claude/)
• Bump copyright year to 2026

Background: Why Is.BinarySerializable broke on Unity 6.5

Unity 6.5 ships com.unity.test-framework 1.7.0, which bumps com.unity.ext.nunit
from 2.0.5 to 2.1.0. Despite the assembly version remaining 3.5.0.0, Unity's custom
NUnit 3.5 fork in 2.1.0 removes BinarySerializableConstraint — because
BinaryFormatter is deprecated in .NET. XmlSerializableConstraint is still present.

The fix adds an ENABLE_UTF_1_7 version define (matching the repo's existing
ENABLE_UTF_1_5 / ENABLE_UTF_1_6 convention) and wraps the
BinarySerializableSample class and its test in #if !ENABLE_UTF_1_7.

[github-actions]

Code Metrics Report

	master (0558116)	#42 (de502e2)	+/-
Coverage	40.3%	39.3%	-1.1%
Code to Test Ratio	1:4.0	1:4.0	+0.0
Test Execution Time	5m20s	5m47s	+27s

Details

  |                     | master (0558116) | #42 (de502e2) |  +/-  |
  |---------------------|------------------|---------------|-------|
- | Coverage            |            40.3% |         39.3% | -1.1% |
  |   Files             |               25 |            25 |     0 |
  |   Lines             |              478 |           478 |     0 |
- |   Covered           |              193 |           188 |    -5 |
+ | Code to Test Ratio  |            1:4.0 |         1:4.0 |  +0.0 |
  |   Code              |             1256 |          1255 |    -1 |
+ |   Test              |             5048 |          5057 |    +9 |
- | Test Execution Time |            5m20s |         5m47s |  +27s |

Code coverage of files in pull request scope (9.4% → 0.0%)

Files	Coverage	+/-	Status
Assets/InputExample/Scripts/Runtime/FirstPersonControllerLegacy.cs	0.0%	-9.5%	affected

---

Reported by octocov