fix: support loading environment files from hidden directories

[techouse]

This PR fixes #197 and restores support for environment files inside hidden directories, such as .env/.env.dev, without requiring a consumer build.yaml.

Changes

• Falls back to package-relative filesystem reads for hidden env paths excluded from build_runner’s asset graph.
• Keeps non-hidden unreadable assets isolated to avoid reading stale generated files.
• Adds an end-to-end build_runner regression test using a consumer package without build.yaml.
• Documents the incremental/watch-mode limitation and optional sources configuration.

Testing

• Full envied_generator suite: 170 tests passed
• dart analyze
• dart format --set-exit-if-changed

[Copilot]

Pull request overview

Restores envied_generator support for loading env files from hidden paths (e.g. .env/.env.dev) under build_runner, while avoiding accidentally reading unrelated unreadable (potentially generated) assets from disk. Adds regression coverage and documents the watch/incremental rebuild limitation for hidden sources.

Changes:

• Add a hidden-path fallback in env loading to read package-relative files directly from disk when build_runner cannot read the asset.
• Add unit tests to validate hidden-path loading and ensure non-hidden unreadable assets do not bypass the asset graph.
• Add an end-to-end build_runner regression test and update README documentation with recommended build.yaml sources globs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/envied_generator/lib/src/load_envs.dart	Adds hidden-path detection and a package-relative filesystem fallback when the asset graph can’t read hidden env files.
packages/envied_generator/test/workspace_resolution_test.dart	Adds tests for hidden env path loading and for preventing bypass on non-hidden unreadable assets; extends test helper to simulate unreadable assets.
packages/envied_generator/test/hidden_directory_build_runner_test.dart	Adds an end-to-end build_runner regression test using a temporary consumer package without build.yaml.
packages/envied_generator/test/.env/.env.dev	Adds hidden env fixture used by tests.
packages/envied_generator/test/stale_generated.env	Adds fixture used to validate unreadable asset behavior.
packages/envied/README.md	Documents hidden env path behavior and the build.yaml sources configuration to enable watch/incremental rebuild triggers.

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[techouse]

@petercinibulk 🙏