⚙️ [Maintenance]: Split repository onboarding defaults

[Marius Storhaug (MariusStorhaug)]

Establishes repository self-sufficiency standards and agent onboarding requirements by isolating agent framework setup and documentation conventions from the broader PR #61.

Changes

• Add AGENTS.md defining the agent framework directive and ecosystem installation/working guidelines
• Add CLAUDE.md importing AGENTS.md for Claude Code integration
• Add .github/copilot-instructions.md pointing to AGENTS.md for GitHub Copilot
• Update src/docs/Modules/Repository-Defaults.md with self-sufficiency requirements and agent onboarding file standards
• Clean up .github/linters/.markdown-lint.yml formatting and add MD025 rule exception
• Temporarily disable update-index actions (Update-ActionList, Update-FunctionAppList) in .github/actions/update-index/src/main.ps1
• Remove assets/javascripts/abbreviation-preview.js

Technical Details

Splits agent-related conventions and repository self-sufficiency policy from PR #61 to enable focused review of onboarding standards. The AGENTS.md file serves as the single source of truth for agent framework setup and working patterns, while CLAUDE.md and .github/copilot-instructions.md delegate to it for consistent integration across IDE surfaces.

• Relates to: Standardize module README + repository, agent, and module-type defaults #61

[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITHUB_ACTIONS_ZIZMOR	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
HTML	Pass ✅
JAVASCRIPT_ES	Pass ✅
JAVASCRIPT_PRETTIER	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
POWERSHELL	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

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