fix(experiments): resolve environment-level variant allocations

[Zaimwa9]

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Changes

Fix experiment list serialiser to return environment-level variant allocations instead of feature-level defaults. Order experiments by newest first.

• ExperimentFeatureSerializer.get_multivariate_options looks up the environment's feature state and overlays the actual percentage_allocation per multivariate option
• order_by("-created_at") on the experiments queryset

How did you test this code?

Manually — created an experiment whose environment-level allocation differs from the feature default and confirmed the serialiser returns the correct percentages. Verified the list endpoint returns newest experiments first.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Jun 19, 2026 7:48am
flagsmith-frontend-preview	Ignored	Preview	Jun 19, 2026 7:48am
flagsmith-frontend-staging	Ignored	Preview	Jun 19, 2026 7:48am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-7805	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-7805	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-7805	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-7805	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7805	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7805	Finished ✅	Results ✅

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 41.7 seconds
 a56947b
 🔄 Run: #17590 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 38 seconds
 a56947b
 🔄 Run: #17590 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 failed

Details

 1 test across 1 suite
 51.5 seconds
 a56947b
 📦 Artifacts: View test results and HTML report
🔄 Run: #17590 (attempt 1)

Failed tests

firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise

### Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 44.4 seconds
 d5c1e2f
 🔄 Run: #17591 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 36.9 seconds
 d5c1e2f
 🔄 Run: #17591 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 1 failed

Details

 1 test across 1 suite
 49.2 seconds
 d5c1e2f
 📦 Artifacts: View test results and HTML report
🔄 Run: #17591 (attempt 1)

Failed tests

firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise

### Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 32 seconds
 758b907
 🔄 Run: #17609 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 44.6 seconds
 758b907
 🔄 Run: #17609 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 1 failed

Details

 1 test across 1 suite
 44.9 seconds
 758b907
 📦 Artifacts: View test results and HTML report
🔄 Run: #17609 (attempt 1)

Failed tests

firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise

### Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 41.6 seconds
 9c8b3f1
 🔄 Run: #17658 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 37.4 seconds
 9c8b3f1
 🔄 Run: #17658 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

Details

 2 tests across 2 suites
 9.6 seconds
 9c8b3f1
 🔄 Run: #17658 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 2 passed

Details

 2 tests across 2 suites
 55.9 seconds
 9c8b3f1
 🔄 Run: #17658 (attempt 1)

[github-actions]

Visual Regression

19 screenshots compared. See report for details.
View full report

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (8977abe) to head (9c8b3f1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7805   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files        1465     1465           
  Lines       56889    56925   +36     
=======================================
+ Hits        56082    56118   +36     
  Misses        807      807           

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