chore: cleanup docs, update gitignore, add markdownlint

[aadil96]

Summary

• Remove stale docs (architecture, operations, references, workflows READMEs)
• Add markdownlint-cli and package.json
• Fix 148 markdownlint violations across 7 files
• Update .gitignore for node_modules

Test Plan

• Verify markdownlint passes: npx markdownlint '**/*.md' --ignore node_modules
• Verify no secrets in committed files

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[what-the-diff]

PR Summary

• Enhancements in .gitignore
  The inclusion of node_modules/ in .gitignore file helps prevent unnecessary tracking of Node Package Manager (npm) files, streamlining the codebase.
• Formatting Updates in README.md
  The code block syntax has been updated from plain to text in README.md, making the instructions more user-friendly and clear.
• Clean-Up of Documentation Files
  Files such as architecture, operations, and references have been taken out from the documentation, removing any potential outdated or redundant information.
• Refinement of Table Formatting in Design Document
  Table formatting in docs/superpowers/plans/2026-05-16-opencode-org-model-design.md was fixed to improve readability.
• Updated Paths in Specification Document
  Explicit $HOME/.zsh/ prefix is now used for paths in docs/superpowers/specs/2026-05-14-zsh-autosuggestions-design.md, adding more clarity while navigating through the files.
• Unified Markdown Formatting
  Inconsistent Markdown formatting across various files has been corrected for a more uniform presentation across headers, tables, and code blocks.
• Creation of package.json
  Introduced package.json to include development dependency for markdownlint-cli, facilitating easy setup for potential contributors.
• Design Document Updates
  Non-functional updates related to organizational model and processes were made in design documents, providing consistent formatting and structure.
• Environment Variable Table Completion in README-ollama.md
  Comprehensive environment variable table has been included in README-ollama.md.
• Instructions Clarity
  User instructions and documentation around tmux commands in tmux-cheatsheet.md have been enhanced for clearer understanding.