Feature/boot profile clarification

[alexlovelltroy]

Description

This pull request updates the boot configuration selection logic to allow profile-less (empty profile) boot requests to select the best matching configuration across all profiles, rather than defaulting to the "default" profile. The changes also clarify the intended behavior for default/catch-all configurations, improve deterministic selection among candidates, and update tests to reflect the new logic.

Boot configuration selection logic:

• Profile-less boot requests now select the best matching configuration across all profiles, using score and priority, instead of always defaulting to the "default" profile. This allows more specific or higher-priority configurations from any profile to be chosen when no profile is specified. [1] [2]

Validation and documentation:

• The requirement for at least one targeting method (hosts, macs, nids, or groups) in BootConfiguration has been removed, allowing for catch-all default configurations. Documentation comments clarify that this is intentional for supporting default profiles. [1] [2]

Deterministic candidate selection:

• When selecting among multiple matching boot configurations, candidates are now sorted by score (descending), then priority (descending), and then name (ascending) to ensure deterministic selection when score and priority are identical.

Test updates:

• Unit and handler tests have been updated to verify that empty or missing profile requests select the best matching configuration across all profiles, not just the "default" profile. New tests cover priority-based selection across profiles. [1] [2] [3] [4] [5] [6]

Checklist

• My code follows the style guidelines of this project
• I have added/updated comments where needed
• I have added tests that prove my fix is effective or my feature works
• I have run make test (or equivalent) locally and all tests pass
• DCO Sign-off: All commits are signed off (git commit -s) with my real name and email
• REUSE Compliance:
  • Each new/modified source file has SPDX copyright and license headers
  • Any non-commentable files include a <filename>.license sidecar
  • All referenced licenses are present in the LICENSES/ directory

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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