feat: Add six-rules skill for applying Orwell's Six Rules

six-rules/SKILL.md

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+---
+name: six-rules
+description: >-
+  Edit text following the Remedy of Six Rules, preserving all semantic context of the markup language being processed.
+  Use this skill whenever the user asks to edit, revise, simplify, or improve writing in any markup language (Markdown, HTML, reStructuredText, etc.).
+  **IMPORTANT**: This skill MUST be consulted BEFORE editing any text content.
+license: MIT
+compatibility: opencode
+metadata:
+  audience: developers
+  workflow: writing
+---
+
+# Apply the Remedy of Six Rules
+
+This skill provides instructions for editing text to be clear, direct, and plain, while fully preserving the semantic context and structure of whatever markup language is being processed.
+
+## When to use this skill
+
+Use this skill when:
+
+- The user asks to edit, revise, simplify, or improve writing
+- The user wants text to be more concise or plain-spoken
+- Writing in any markup language (Markdown, HTML, reStructuredText, AsciiDoc, etc.)
+
+## The Six Rules
+
+These rules are drawn from George Orwell's essay "Politics and the English Language" (1946).
+Apply them to all text editing:
+
+1. Never use a metaphor, simile, or other figure of speech which you are used to seeing in print.
+2. Never use a long word where a short one will do.
+3. If it is possible to cut a word out, always cut it out.
+4. Never use the passive where you can use the active.
+5. Never use a foreign phrase, a scientific word, or a jargon word if you can think of an everyday English equivalent.
+6. Break any of these rules sooner than say anything outright barbarous.
+
+## Markup Preservation
+
+When editing text inside markup:
+
+- **Do not alter** markup syntax: keep all tags, attributes, formatting markers, and structure intact
+- **Only edit** the human-readable text content between or within markup elements
+- **Preserve** all semantic meaning: links, references, code, lists, tables, and other structured elements must remain functionally identical
+- **Keep** code blocks, inline code, and other literal content untouched
+- **Maintain** document structure: headings, sections, and hierarchy must not change
+- **Retain** all special characters, escape sequences, and formatting required by the markup language
+
+## Editing Principles
+
+- Prefer short, direct sentences
+- Use active voice wherever possible
+- Replace verbose phrases with simpler alternatives
+- Remove filler words and redundant expressions
+- Choose familiar words over obscure or technical ones
+- Never sacrifice clarity or introduce awkwardness just to follow a rule -- rule six overrides all others