feat: add deployment environment profiles

[ibourgeois]

Summary

• generate shared Helm values plus named environment overlays for local, staging, and production
• teach beacon:deploy to select an environment profile and apply both the shared and environment-specific values files during Helm deploys
• add chart generation, install, deploy, and profile discovery coverage so environment-specific behavior stays consistent

Testing

php84 vendor/bin/pest tests/Unit/Helm/HelmChartGeneratorTest.php tests/Unit/Deploy/DeploymentEnvironmentProfileRepositoryTest.php tests/Feature/DeployCommandTest.php tests/Feature/InstallCommandTest.php
php84 "/Users/ibourgeois/Library/Application Support/Herd/bin/composer" test
php84 "/Users/ibourgeois/Library/Application Support/Herd/bin/composer" validate --strict --no-check-publish

Closes #47

[Copilot]

Pull request overview

Adds first-class “deployment environment profiles” to Beacon’s Helm workflow by generating per-environment values overlays and teaching beacon:deploy to apply both shared + environment-specific values during Helm upgrades.

Changes:

• Generate values.local.yaml, values.staging.yaml, and values.production.yaml alongside values.yaml in Helm chart scaffolds.
• Add environment profile discovery + selection (interactive prompt + --environment flag) and pass both values files to Helm.
• Expand unit/feature coverage for chart generation, environment discovery, install output, and deploy behavior; update README.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/Helm/HelmChartGenerator.php	Adds overlay values files to generated chart outputs.
stubs/helm/values.local.yaml.stub	New local overlay defaults (replicas/image tag/env).
stubs/helm/values.staging.yaml.stub	New staging overlay defaults.
stubs/helm/values.production.yaml.stub	New production overlay defaults.
src/Deploy/DeploymentEnvironmentProfiles.php	Introduces profile set model (defaults, prompt options, overlay path helpers).
src/Deploy/DeploymentEnvironmentProfileRepository.php	Discovers available profiles from values.*.yaml overlays.
src/Commands/DeployCommand.php	Adds --environment, prompts for env, and applies shared + overlay values in deploy.
src/Deploy/HelmReleaseDeployer.php	Adds support for passing multiple -f values files to Helm.
tests/Unit/Helm/HelmChartGeneratorTest.php	Verifies overlays are rendered and written.
tests/Unit/Deploy/DeploymentEnvironmentProfileRepositoryTest.php	Verifies discovery + ordering + default behavior.
tests/Feature/InstallCommandTest.php	Asserts overlays are generated by install flow.
tests/Feature/DeployCommandTest.php	Asserts deploy prompts/flags and Helm arguments include both values files.
README.md	Documents overlay generation and deploy behavior.

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