Add external measure manager for non-gem repos

[kflemin]

Adds support for managing and consuming external (non-gem) OpenStudio measure repositories via a manifest, including install/list rake tasks and updated OSW path ordering so local measures take precedence.

Changes:

• Introduces BOSS::ExternalMeasureRepoManager + default manifest (config/external_measure_repos.yml) to resolve/install external measure roots.
• Updates BOSS::Boss#write_baseline_osw to order measure_paths / file_paths as: local → gem-discovered → external repos.
• Adds unit tests for the manager and for Boss measure path ordering; updates CI to run the full RSpec suite.

[Copilot]

Pull request overview

Adds support for managing and consuming external (non-gem) OpenStudio measure repositories via a manifest, including install/list rake tasks and updated OSW path ordering so local measures take precedence.

Changes:

• Introduces BOSS::ExternalMeasureRepoManager + default manifest (config/external_measure_repos.yml) to resolve/install external measure roots.
• Updates BOSS::Boss#write_baseline_osw to order measure_paths / file_paths as: local → gem-discovered → external repos.
• Adds unit tests for the manager and for Boss measure path ordering; updates CI to run the full RSpec suite.

Reviewed changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
spec/tests/unit/external_measure_repo_manager_spec.rb	Adds unit coverage for manifest parsing, validation, and resolved directories behavior.
spec/tests/unit/boss_spec.rb	Tests ordering/deduping of measure_paths when combining local, gem, and external repo roots.
README.md	Documents external measure installation/listing and precedence rules.
Rakefile	Adds measures:install_external and measures:list_external tasks.
lib/measures/.gitkeep	Ensures local measures directory exists in-repo.
lib/BOSS/external_measure_repo_manager.rb	New manager to validate manifest, clone/fetch repos (sparse checkout), and resolve measure roots.
lib/BOSS/constants.rb	Adds constants for local measures dir, external manifest path, and install directory.
lib/BOSS/boss.rb	Integrates external/local/gem path ordering into OSW generation and derives file_paths.
lib/boss_cli.rb	Updates CLI help text and changes run_osw argument handling.
Gemfile.lock	Adds RuboCop performance/checkstyle formatter dev dependencies.
config/external_measure_repos.yml	Ships default external measure manifest (local roots + comstock repo roots).
.github/workflows/ci.yml	Simplifies CI test execution to bundle exec rspec.

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