Add Laravel Boost skill: resources/boost/skills/anourvalar-eloquent-validation/SKILL.md

[AnourValar]

Summary

Adds a laravel/boost skill so AI agents working in projects that depend on anourvalar/eloquent-validation automatically pick up the package's public surface.

The new file: resources/boost/skills/anourvalar-eloquent-validation/SKILL.md

What it documents (all verified against the source):

• The package ships no facades - the section explicitly says so.
• ModelTrait - the trait-defined properties ($trim, $nullable, $computed, $unchangeable, $unique, $jsonNested) and added methods (validate, validateDelete, beforeValidate, scopeFields, scopePublishFields, authorize, mergeJsonNested, setAttribute overrides, ...).
• CrudService::execute / sync for bulk create/update/delete and reconciliation flows.
• ValidatorHelper (afterValidate, mutateArray, mutateJsonb, isMatching).
• Exceptions\ValidationException (addPrefix, replaceKey).
• Features\ManyToManyTrait::onChangedM2M for observer-driven pivot sync.
• Tests\ValidationTrait PHPUnit helpers (assertValidationSuccess, assertValidationFailed, etc.).
• The five globally-registered custom validation rules (config:<key>, array_keys, array_keys_only, array_keys_id, not_empty) and the :max/:min replacer override.
• The three artisan commands: make:model-validation, make:observer-validation, model:validate.
• The non-obvious gotchas (setAttribute strictness outside production, the unique rule canonisation, attribute-name caching, soft-delete-aware uniqueness checks, etc.).

Format follows the Boost skill spec: YAML frontmatter (name, description) plus a focused, agent-oriented markdown body.

Test plan

• Maintainer reviews factual accuracy against src/ (trait property handling, validate/validateDelete signatures, registered rules, artisan commands).
• Description correctly activates for model-validation tasks in Boost.
• No other files changed in the repo (single new SKILL.md under resources/boost/skills/).

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