chore: Add strong-opx claude skill

[panchgonzalez]

Adds a Claude Code skill and CLAUDE.md so Claude has full contextual knowledge of the Strong-OpX CLI — commands, architecture, and safe-operation guidelines — without manual explanation each session.

Related Issue

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Type of Change

• Bug fix
• New feature
• Performance Improvement
• Documentation update
• Other (please describe):

Checklist

• I have read the contributing guidelines.
• My code follows the code style of this project.
• I have tested my changes.
• I have updated the documentation accordingly.
• All tests pass successfully.
• My changes generate no new warnings or errors.

Screenshots (if applicable)

N/A

Additional Notes

Three files changed:

.claude/skills/strong-opx/SKILL.md — A 379-line Claude Code skill covering every CLI subsystem: installation, project/environment setup, vars & secrets, deploy, Terraform, Helm, Kubernetes, Docker, Packer, compute management, SSH/SCP, Ansible, AWS MFA, and templating. Includes ready-to-run command examples and a permission table marking which operations (e.g. terraform apply, production deploy, vars decrypt) require explicit user confirmation before Claude executes them. Auto-invokes when strong-opx.yml is present in the workspace.

CLAUDE.md — Project-level instructions for Claude Code: lint/test commands, core architectural concepts (Project, Environment, Provider, Platform), key-module reference table, testing conventions (tests/mocks.py factories), and semantic-release commit conventions.

Makefile — Adds make install-skill to copy the skill into ~/.claude/skills/strong-opx/ for local use.

Reviewer Suggestions

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Checklist for Reviewers

• Code follows project standards.
• Changesets are adequately tested.
• Documentation is updated and accurate.
• The purpose of the PR is clearly stated.
• The PR title is descriptive.