Prompt manager snapshot test is environment-dependent with local skill pollution

[sunilkumarvalmiki]

Summary

agents::prompt_manager::tests::test_all_platform_extensions is environment-dependent and fails when extra local skills/plugins are installed.

Environment

• Repo: aaif-goose/goose
• Commit tested: 3f5277538d5f6df1a88faca5e77cecc0ee208ae1 (origin/main)
• Host: macOS 26.4.1 (arm64)
• Date tested: 2026-04-11

Reproduction

source bin/activate-hermit
cargo test -p goose --lib

Expected

Snapshot test should be deterministic across machines and only include project-controlled platform extension skill text.

Actual

Test fails with snapshot diff because machine-local skills are injected into the prompt (e.g. capacity, customize, deploy-model, microsoft-foundry, preset).

Impact

• Failing CI/local tests depending on developer environment
• Non-deterministic prompt content for platform extensions
• Snapshot churn and noisy diffs

Evidence

• Log excerpt: https://github.com/sunilkumarvalmiki/goose/blob/bughunt/evidence-20260411/.artifacts/bug-hunt-20260411_233319/issues/bug1_prompt_snapshot_failure_excerpt.txt
• Screenshot:
• Evidence video (all bugs): https://github.com/raw/sunilkumarvalmiki/goose/bughunt/evidence-20260411/.artifacts/bug-hunt-20260411_233319/screenshots/bug-evidence-summary.mp4