Make manifest-version optional in aw.yml

[Copilot]

manifest-version was already optional in the JSON schema and Go parsing code (omitting it defaults to "1"), but there was no explicit test coverage for the omitted case, and the reference doc example implied it was required.

Changes

• pkg/cli/add_package_manifest_test.go — adds "accepts manifest without manifest-version" sub-test to TestResolveRepositoryPackage
• pkg/cli/compile_repository_manifest_test.go — adds TestCompileWorkflows_AcceptsManifestWithoutManifestVersion for the local compile path
• docs/reference/aw-yml-package-manifest.md — strips manifest-version (and min-version) from the example, showing the minimal valid form:

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[Copilot]

Pull request overview

This PR aligns the aw.yml package manifest documentation and test coverage with existing behavior: manifest-version is optional and defaults to "1" when omitted, and both the remote package install path (gh aw add) and local repository compile validation (gh aw compile) now have explicit tests for the omitted case.

Changes:

• Added a subtest to ensure resolveRepositoryPackage accepts manifests that omit manifest-version (remote/package-add path).
• Added a compile-path test ensuring repository-root aw.yml validation succeeds when manifest-version is omitted (local compile path).
• Updated the reference documentation example to omit manifest-version (and min-version) to reflect the minimal valid form.

Show a summary per file

File	Description
pkg/cli/add_package_manifest_test.go	Adds coverage that repository package resolution accepts aw.yml without manifest-version.
pkg/cli/compile_repository_manifest_test.go	Adds coverage that local gh aw compile manifest validation accepts aw.yml without manifest-version.
docs/src/content/docs/reference/aw-yml-package-manifest.md	Updates the example manifest to reflect that manifest-version (and min-version) are optional.

Review details

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• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Low