fix: load hidden environment files on Windows

[techouse]

Summary

• Resolve hidden environment files through the package configuration instead of Isolate.resolvePackageUri.
• Add end-to-end coverage for both .env and .env/.env.dev.
• Run the hidden-file regression tests on Windows and gate publish dry-runs on them.

Problem

The filesystem fallback added in #198 restored hidden environment-file support on Linux and macOS, but still failed under build-runner’s AOT process on Windows.

Although the files existed, Isolate.resolvePackageUri could not resolve the consumer package root. Envied consequently reported:

Environment variable file doesn't exist at `.env`.

Pinning envied_generator to 1.3.5 avoided the regression because that version read relative paths directly from the filesystem.

Solution

Use findPackageConfig(Directory.current) to load .dart_tool/package_config.json, locate the package identified by AssetId.package, and resolve the environment path against its declared package root.

This approach:

• Works under build-runner AOT on Windows.
• Preserves package-relative resolution in Dart workspaces.
• Retains the Dart 3.9 minimum SDK through package_config 2.2.x.
• Continues restricting filesystem fallback to hidden paths.

Testing

• Added real build-runner fixtures for:
  • .env
  • .env/.env.dev
• Added a focused windows-latest CI job.
• All 171 envied_generator tests pass locally.
• Dart analysis passes.
• Windows, Ubuntu, and minimum Dart 3.9 GitHub Actions checks pass.

Fixes #200.

[Copilot]

Pull request overview

This PR fixes a Windows-specific regression in envied_generator where hidden environment files (e.g. .env and .env/.env.dev) fail to resolve under build_runner AOT by switching resolution from Isolate.resolvePackageUri to .dart_tool/package_config.json via package_config. It also strengthens end-to-end coverage and adds a Windows CI job to prevent regressions.

Changes:

• Resolve hidden env file paths via findPackageConfig(Directory.current) + package root lookup instead of Isolate.resolvePackageUri.
• Expand the build_runner regression test to cover both .env and .env/.env.dev.
• Add a Windows GitHub Actions job to run the hidden-env build_runner test and gate publish dry runs on it.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/envied_generator/lib/src/load_envs.dart	Switches hidden-path filesystem fallback from Isolate.resolvePackageUri to package_config-based resolution.
packages/envied_generator/pubspec.yaml	Adds package_config dependency needed for package-root resolution.
packages/envied_generator/test/hidden_directory_build_runner_test.dart	Extends the e2e build_runner fixture test to validate both .env and hidden-directory env paths.
.github/workflows/test.yml	Adds a Windows CI job to run the hidden env-file regression test and makes publish dry-runs depend on it.

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