Stabilize mutation seed dry runs

[joesobo]

Summary

• keep dynamically imported plugin package fixtures inside the worktree cache so Stryker sandboxed dry runs can resolve them
• make bundled-plugin tests fail loudly on swallowed package-load warnings
• give the mock-heavy undo dependency bridge test a focused timeout for instrumented mutation dry runs

Verification

• pnpm --filter @codegraphy-dev/core exec vitest run --config vitest.config.ts tests/plugins/packageRuntime.test.ts
• pnpm --filter @codegraphy-dev/extension exec vitest run --config vitest.config.ts tests/extension/pipeline/plugins/bootstrap.test.ts
• pnpm --filter @codegraphy-dev/extension exec vitest run --config vitest.config.ts tests/extension/graphView/webview/providerMessages/listener.test.ts -t "wires the default undo-execution dependency"
• pnpm run lint
• pre-commit typecheck
• mutation seed dry-run reached "Initial test run succeeded" for core/core, extension/host-platform-core-shared, extension/host-indexing, extension/host-graphview-model, extension/host-graphview-provider; local runs were stopped after dry-run success to avoid multi-hour full seed refreshes

[changeset-bot]

⚠️ No Changeset found

Latest commit: fad0371

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR