docs(PF-4156): codify description formula and rewrite all skill descriptions

[jpuzz0]

Summary

• Adds a "Writing descriptions" section to CONTRIBUTING-SKILLS.md with a formula, rules, and good/bad examples for skill/agent frontmatter descriptions
• Rewrites all 26 skill/agent descriptions to follow the new formula: action verb + what it does + "Use when..." trigger contexts
• Removes duplicated content from CONTRIBUTING.md (plugin naming table, skills vs agents guidance) and replaces with links to CONTRIBUTING-SKILLS.md as the single source of truth
• Removes stale GitLab confidential issue line from SECURITY.md

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📥 Commits

Reviewing files that changed from the base of the PR and between cec2eed and 87cc182.

📒 Files selected for processing (30)

• CONTRIBUTING-SKILLS.md
• CONTRIBUTING.md
• PLUGINS.md
• SECURITY.md
• plugins/design-foundations/skills/css-var-analyzer/SKILL.md
• plugins/design-foundations/skills/icon-finder/SKILL.md
• plugins/design-foundations/skills/pf-ai-experience-patterns/SKILL.md
• plugins/design-foundations/skills/pf-analyze-modifiers/SKILL.md
• plugins/design-foundations/skills/pf-class-migration-scanner/SKILL.md
• plugins/design-foundations/skills/pf-raw-colors-scan/SKILL.md
• plugins/design-foundations/skills/pf-token-auditor/SKILL.md
• plugins/design-foundations/skills/pf-tokens/SKILL.md
• plugins/figma/skills/figma-changes/SKILL.md
• plugins/figma/skills/figma-icon-finder/SKILL.md
• plugins/figma/skills/pf-compliance-checker/SKILL.md
• plugins/figma/skills/pf-design-mode/SKILL.md
• plugins/issue-management/skills/duplicate-epic/SKILL.md
• plugins/issue-management/skills/pf-bug-triage/SKILL.md
• plugins/issue-management/skills/pf-create-issue/SKILL.md
• plugins/issue-management/skills/quarterly-initiative-report/SKILL.md
• plugins/issue-management/skills/summarize-jira-issues/SKILL.md
• plugins/react/agents/pf-coding-standards.md
• plugins/react/agents/pf-unit-test-standards.md
• plugins/react/skills/pf-component-structure/SKILL.md
• plugins/react/skills/pf-import-checker/SKILL.md
• plugins/react/skills/pf-library-test-writer/SKILL.md
• plugins/react/skills/pf-unit-test-generator/SKILL.md
• plugins/react/skills/write-example-description/SKILL.md
• plugins/repo-management/skills/analytics-repo-pruning/SKILL.md
• plugins/repo-management/skills/pf-org-version-update/SKILL.md

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