Add production readiness checklist

- Document all critical, important, and nice-to-have items
- Provide clear status for each item
- Include release checklist
- Recommendation for initial 0.1.0 release

Author: MarsZDF

PRODUCTION_READINESS.md

@@ -0,0 +1,172 @@
+# Production Readiness Checklist
+
+This document tracks what needs to be done before shipping Ferrum to production (e.g., publishing to crates.io).
+
+## ✅ Completed
+
+- [x] All critical parsing bugs fixed (15/15 tests passing)
+- [x] Comprehensive test suite
+- [x] CI/CD pipeline setup
+- [x] Basic documentation
+- [x] Examples provided
+- [x] Author information updated
+- [x] AI Assistant Guide in README
+
+## 🔴 Critical (Must Fix Before Release)
+
+### 1. Fix Clippy Warnings
+**Status**: ⚠️ 3 warnings in `fortran-lexer`
+**Location**: `fortran-lexer/src/lexer.rs`
+
+- [ ] **Line 59**: Remove unused `source` field from `FreeFormatLexer` struct
+  ```rust
+  // Current: pub struct FreeFormatLexer<'a> { source: &'a str, ... }
+  // Fix: Remove `source` field or mark with #[allow(dead_code)] if needed later
+  ```
+
+- [ ] **Line 111**: Fix unnecessary closure in `unwrap_or_else`
+  ```rust
+  // Current: .ok_or_else(|| LexError::UnexpectedChar { ... })
+  // Fix: Use .ok_or(LexError::UnexpectedChar { ... }) instead
+  ```
+
+- [ ] **Line 411**: Simplify `map_or` usage
+  ```rust
+  // Current: self.chars.peek().map_or(false, |&ch| ch == expected)
+  // Fix: self.chars.peek().map_or(false, |&ch| ch == expected) can use matches! macro
+  ```
+
+**Command to check**: `cargo clippy --all -- -D warnings`
+
+### 2. Complete Cargo.toml Metadata
+**Status**: ✅ fortran-lexer done, ⚠️ others complete
+
+- [x] fortran-lexer: description, keywords, categories added
+- [x] fortran-parser: description, keywords, categories already present
+- [x] fortran-ast: description, keywords, categories already present
+- [x] Author information updated in workspace Cargo.toml
+
+### 3. Add Comprehensive Rustdoc Documentation
+**Status**: ⚠️ Basic docs exist, need enhancement
+
+- [ ] Add doc comments to all public APIs
+- [ ] Add usage examples to key functions
+- [ ] Document error conditions
+- [ ] Add examples module with practical use cases
+- [ ] Ensure all public types have `#[doc]` attributes
+
+**Command to check**: `cargo doc --no-deps --all --open`
+
+## 🟡 Important (Should Fix for Quality)
+
+### 4. Create CHANGELOG.md
+**Status**: ❌ Not created
+
+- [ ] Create `CHANGELOG.md` following [Keep a Changelog](https://keepachangelog.com/) format
+- [ ] Document all breaking changes
+- [ ] Document new features
+- [ ] Document bug fixes
+- [ ] Link to issues/PRs where relevant
+
+### 5. Add More Examples
+**Status**: ⚠️ Basic examples exist
+
+- [ ] Real-world usage examples (parsing actual FORTRAN files)
+- [ ] Error handling examples
+- [ ] Performance optimization examples
+- [ ] Integration examples (using multiple crates together)
+
+### 6. Test Coverage Enhancement
+**Status**: ⚠️ Good coverage, but can improve
+
+- [ ] Add doc tests for public APIs
+- [ ] Add edge case tests
+- [ ] Add error path tests
+- [ ] Add fuzz testing (optional but recommended)
+- [ ] Test with real-world FORTRAN codebases
+
+### 7. Version Management
+**Status**: ✅ 0.1.0 is appropriate for initial release
+
+- [x] Version 0.1.0 set (appropriate for initial release)
+- [ ] Document versioning strategy (semver)
+- [ ] Set up release tags and branches if needed
+
+## 🟢 Nice to Have (Can Be Done Post-Release)
+
+### 8. Security Audit
+**Status**: ⚠️ Not done
+
+- [ ] Run `cargo audit` (requires `cargo-audit` tool)
+- [ ] Review dependencies for known vulnerabilities
+- [ ] Document security policy
+
+### 9. Performance Benchmarks
+**Status**: ⚠️ Benchmarks exist but need documentation
+
+- [x] Criterion benchmarks exist for lexer and parser
+- [ ] Document performance characteristics
+- [ ] Add performance regression tests
+- [ ] Publish benchmark results
+
+### 10. API Stability
+**Status**: ⚠️ Not explicitly marked
+
+- [ ] Mark APIs as stable/unstable if using unstable features
+- [ ] Document breaking change policy
+- [ ] Consider adding `#[deprecated]` attributes for future changes
+
+### 11. Publishing to crates.io
+**Status**: ❌ Not published
+
+- [ ] Create crates.io accounts
+- [ ] Test publishing to a test index first
+- [ ] Verify all metadata is correct
+- [ ] Publish in order: fortran-lexer → fortran-ast → fortran-parser
+- [ ] Verify published crates work correctly
+
+### 12. Additional Documentation
+**Status**: ⚠️ Basic docs exist
+
+- [ ] Architecture documentation
+- [ ] Contributing guide (beyond what's in README)
+- [ ] Code of conduct (optional but recommended)
+- [ ] Security policy (SECURITY.md)
+- [ ] License file verified (✅ already exists)
+
+## 🚀 Release Checklist
+
+When ready to release:
+
+1. [ ] Fix all critical items above
+2. [ ] Run `cargo test --all` - ensure all tests pass
+3. [ ] Run `cargo clippy --all -- -D warnings` - ensure no warnings
+4. [ ] Run `cargo fmt --all` - ensure code is formatted
+5. [ ] Update CHANGELOG.md with release notes
+6. [ ] Update version numbers if needed
+7. [ ] Create git tag for release
+8. [ ] Publish to crates.io (if applicable)
+9. [ ] Create GitHub release
+10. [ ] Announce release (if applicable)
+
+## 📊 Current Status Summary
+
+- **Critical Items**: 3 remaining (all clippy warnings)
+- **Important Items**: 4 remaining (docs, changelog, examples, tests)
+- **Nice to Have**: 5 items (can be done post-release)
+
+**Estimated Time to Production-Ready**: 
+- Fix critical items: ~30 minutes
+- Fix important items: ~2-3 hours
+- Nice to have: Can be done incrementally
+
+## 🎯 Recommendation
+
+**For initial release (0.1.0)**:
+1. Fix the 3 clippy warnings (critical)
+2. Add basic CHANGELOG.md (important)
+3. Enhance a few key doc comments (important)
+4. Ship it! 🚀
+
+The codebase is functionally complete and well-tested. The remaining items can be addressed in subsequent releases.
+