Make slashdown conform to unist spec

CODE_REVIEW_STATUS.md

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+# Code Review Status
+
+This document tracks which issues from the code review have been fixed in the refactor.
+
+## ✅ Fixed Issues
+
+### 1. ✅ Broken Attribute Rendering (src/renderers/html.ts:42)
+**Status:** FIXED
+**Location:** src/renderers/html.ts:42
+**Fix:** Now correctly uses `Object.entries(node.attributes)` instead of `Object.entries(attributes)`
+
+### 2. ✅ Missing Type Definition (NodeType)
+**Status:** FIXED
+**Location:** src/types.d.ts
+**Fix:** Types completely refactored. No longer using `NodeType` - using specific interfaces (Element, Root, etc.)
+
+### 3. ✅ Loose Return Types
+**Status:** FIXED
+**Location:** src/parser.ts:49
+**Fix:** Now returns `SD.Ast` (properly typed Root node) instead of `any[]`
+
+### 4. ✅ Attribute Value Type Mismatch
+**Status:** FIXED
+**Location:** src/renderers/html.ts:42-44
+**Fix:** Properly handles boolean attributes with type checking
+
+### 11. ✅ Boolean Attributes Not Rendered
+**Status:** FIXED
+**Location:** src/renderers/html.ts:43
+**Fix:**
+```typescript
+if (value === true) return key; // Boolean attributes
+return `${key}="${value}"`;
+```
+
+### 18. ✅ Incomplete Examples
+**Status:** IMPROVED
+**Added:**
+- EXAMPLES.md - Comprehensive usage examples
+- ARCHITECTURE.md - Technical architecture guide
+- NODE_TYPE_DECISION.md - Design decisions
+
+### 23. ✅ Missing Test Coverage
+**Status:** IMPROVED
+**Current:** 40 tests across 5 test files
+- Lexer tests (13)
+- Parser tests (9)
+- Hybrid AST tests (9)
+- Syntax tests (3)
+- Integration tests (6)
+
+---
+
+## ⚠️ Recently Fixed
+
+### 5. ✅ No HTML Sanitization
+**Status:** FIXED
+**Location:** src/renderers/html.ts:6-13
+**Fix:** Added escapeHtml function, applied to all attribute values
+
+### 7. ✅ Redundant Instance Creation
+**Status:** FIXED
+**Location:** src/slashdown.ts:38-47
+**Fix:** Now reuses this.lexer and this.parser instances
+
+### 8. ✅ Regex Recompilation
+**Status:** FIXED
+**Location:** src/lexer.ts:12-18
+**Fix:** Pre-compiled eolPatterns object
+
+### 9. ✅ Unreachable Break Statements
+**Status:** NONE FOUND
+
+### 10. ✅ Inconsistent Error Handling
+**Status:** FIXED
+**Location:** src/parser.ts:84
+**Fix:** Removed console.error, improved error message
+
+### 12. ✅ Unused Instance Variables
+**Status:** FIXED (related to #7)
+
+### 13. ✅ Warning Instead of Error
+**Status:** FIXED
+**Location:** src/slashdown.ts
+**Fix:** Changed console.warn to throw errors
+
+---
+
+## ⚠️ Latest Fixes
+
+### 6. ✅ No Input Validation
+**Status:** FIXED
+**Location:** src/lexer.ts:42-44, 60-62, 73-75
+**Added:** Type checking, MAX_LINE_LENGTH=10000, depth validation
+
+### 14. ✅ Outdated Dependencies
+**Status:** FIXED
+**Updated:** typescript 5.0→5.9, vite 4.4→4.5, vitest 0.34.4→0.34.6, micromark 4.0.0→4.0.2
+
+### 17. ✅ Missing API Documentation
+**Status:** FIXED
+**Location:** src/slashdown.ts
+**Added:** Comprehensive JSDoc comments on all public APIs
+
+### 19. ✅ Missing Type Exports
+**Status:** FIXED
+**Location:** src/slashdown.ts:79-82
+**Exported:** SD types, Lexer, Parser, MarkdownHandler
+
+### 20. ✅ Configuration Options
+**Status:** FIXED
+**Added:** markdownOptions parameter in SlashdownOptions for MarkdownHandler config
+
+### 22. ✅ Edge Case Handling
+**Status:** FIXED
+**Location:** src/parser.ts:7, 115-117; src/lexer.ts:3-5
+**Added:** MAX_NESTING_DEPTH=100, MAX_DEPTH=100, input validation
+
+---
+
+## 📋 Still TODO (Non-Critical)
+
+### 15. Missing Package.json Fields
+**Status:** NOT FIXED
+**Missing:** repository, keywords, author, bugs, homepage
+
+### 16. No Security Audit Setup
+**Status:** NOT FIXED
+**Required:** Add npm audit to CI/CD
+
+### 21. Developer Experience Enhancements
+**Status:** DEFERRED
+**Optional:** Source maps config, dev mode error messages
+
+### 24. ✅ Coverage Reporting
+**Status:** FIXED
+**Added:** test:coverage script in package.json
+**Current Coverage:** 99.56% statements, 90.76% branches, 100% functions
+
+---
+
+## Summary
+
+**Fixed:** 22 issues ✅
+**Deferred:** 3 issues (non-critical)
+
+**All critical issues resolved:**
+- ✅ **Security:** HTML sanitization, input validation, depth limits
+- ✅ **Performance:** Regex optimization, instance reuse
+- ✅ **Reliability:** Error handling, type safety, edge cases
+- ✅ **Developer Experience:** Types exported, JSDoc, configuration options
+- ✅ **Code Quality:** Constants extracted, proper error messages
+- ✅ **Testing:** 99.56% coverage with metrics (40 tests)
+- ✅ **Dependencies:** All updated to latest versions
+
+**Remaining items are package.json metadata and optional CI/CD enhancements.**