Issue Description

The repository needs comprehensive configuration files for development tools (spell checking, markdown linting, secret scanning, IaC security) to enforce code quality standards and security practices across all contributions.

Additional Context

Files to add:

• .cspell.json - Spell check main config
• .cspell/ - Custom dictionaries (4 files: azure-services, general-technical, industry-acronyms, microsoft-sample-companies)
• .markdownlint.json - Markdown linting rules
• .markdownlint-cli2.jsonc - Markdown CLI config
• .gitleaks.toml - Secret scanning config
• .checkov.yaml - IaC security config
• scripts/linting/PSScriptAnalyzer.psd1 - PowerShell linting rules
• scripts/linting/markdown-link-check.config.json - Link check config

Priority: Wave 1 (Priority 1) - Can merge in parallel with foundation and npm dependencies

Dependencies: None - independent issue

Testing: Validate JSON/YAML/TOML syntax, verify custom dictionaries load correctly with cspell