docs: update all documentation for v0.2.0-beta release

Complete documentation update for v0.2.0-beta:

CHANGELOG.md:
- Set release date: 2025-11-06
- Document v5 Writer features (all numeric types, complex, multi-dim, both endianness)
- Document critical parser bug fixes (tag detection, multi-dim arrays, multiple vars)
- Update quality metrics (78.5% coverage, 100% tests passing)

README.md:
- Update Known Limitations section (v0.1.1-beta → v0.2.0-beta)
- Remove "v5 format writing not yet implemented" (IT IS implemented!)
- Remove "Reader Issues" section (parser bugs FIXED in v0.2.0-beta)
- Update What Works Well with v0.2.0-beta achievements
- Update version footer: v0.2.0-beta, date: 2025-11-06
- Status: "both v5 and v7.3 formats"

ROADMAP.md:
- Update current version: v0.2.0-beta
- Update version strategy timeline (3 days for v0.2.0-beta!)
- Update Reader Implementation: 100% (parser bugs fixed)
- Update Writer Implementation: 95% (v5 Writer complete)
- Add Phase 2 section with deliverables and achievements
- Update Current Focus: Post v0.2.0-beta (v0.3.0 planning)
- Remove outdated "Decision Point" sections
- Update HDF5 dependency: v0.11.5-beta
- Update quality metrics throughout

All public documentation now accurately reflects v0.2.0-beta reality

Author: kolkov

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ---
 
-## [Unreleased - v0.2.0]
+## [0.2.0-beta] - 2025-11-06
 
 ### Added - v5 Writer Support ✨
 - **v5 Writer**: Complete MATLAB v5 format writer implementation

README.md

@@ -225,24 +225,27 @@ func main() {
 | Cell arrays          | ❌ Future    | ❌ Future    |
 | Compression          | ❌ Future    | ❌ Future    |
 
-## Known Limitations (v0.1.1-beta)
+## Known Limitations (v0.2.0-beta)
 
 ### Writer Limitations
-- **v5 format writing not yet implemented** (coming in v0.2.0)
 - No compression support yet
 - No structures/cell arrays writing yet
+- Character arrays (partial support for v5 Writer)
 
-### Reader Issues
-- Some bugs with multi-dimensional arrays (being fixed)
+### Reader Limitations
 - Limited support for structures and cell arrays
-- Multiple variables in one file may have issues
+- No compression support
 
 ### What Works Well ✅
-- All numeric types (double, single, int8-64, uint8-64)
-- Multi-dimensional arrays (write)
-- **Complex numbers** (proper MATLAB v7.3 format) ✨ FIXED in v0.1.1-beta
-- Round-trip write → read verified
-- Cross-platform (Windows, Linux, macOS)
+- ✅ **v5 Writer COMPLETE** - All numeric types, complex numbers, multi-dimensional arrays ✨ NEW in v0.2.0-beta
+- ✅ **v7.3 Writer COMPLETE** - Full HDF5-based writing
+- ✅ **Parser bugs FIXED** - Multi-dimensional arrays, multiple variables ✨ FIXED in v0.2.0-beta
+- ✅ All numeric types (double, single, int8-64, uint8-64)
+- ✅ Multi-dimensional arrays (read & write)
+- ✅ Complex numbers (proper MATLAB format for both v5 and v7.3)
+- ✅ Round-trip verified (v5 write → read, v7.3 write → read)
+- ✅ Cross-platform (Windows, Linux, macOS)
+- ✅ Both endianness (MI/IM for v5)
 
 See [CHANGELOG.md](CHANGELOG.md) for detailed limitations and planned fixes.
 
@@ -381,9 +384,9 @@ This project is licensed under the MIT License - see the [LICENSE](LICENSE) file
 
 ---
 
-**Status**: Beta - Read and Write support for v7.3 format (proper complex numbers!)
-**Version**: v0.1.1-beta
-**Last Updated**: 2025-11-03
+**Status**: Beta - Read and Write support for both v5 and v7.3 formats!
+**Version**: v0.2.0-beta
+**Last Updated**: 2025-11-06
 
 **Ready for**: Testing, feedback, and real-world usage
 **Not ready for**: Production use (API may change)

ROADMAP.md

@@ -2,7 +2,7 @@
 
 > **Strategic Approach**: Leverage existing HDF5 library and MATLAB documentation
 
-**Last Updated**: 2025-11-03 | **Current Version**: v0.1.1-beta (RELEASED ✅) | **Target**: v1.0.0 stable (2026)
+**Last Updated**: 2025-11-06 | **Current Version**: v0.2.0-beta (RELEASED ✅) | **Target**: v1.0.0 stable (2026)
 
 ---
 
@@ -40,8 +40,8 @@ Build a **production-ready, pure Go MATLAB file library** with comprehensive **r
 v0.1.0-beta (RELEASED ✅) → Reader v5/v7.3 + Writer v7.3 (workaround complex)
          ↓ (1 day!)
 v0.1.1-beta (RELEASED ✅) → Proper MATLAB complex format + race detector fix
-         ↓ (3-4 weeks)
-v0.2.0 → v5 Writer + bug fixes + improvements
+         ↓ (3 days!)
+v0.2.0-beta (RELEASED ✅) → v5 Writer + parser bug fixes + comprehensive tests
          ↓ (2-3 weeks)
 v0.3.0 → Functional Options Pattern (flexible API)
          ↓ (2-3 weeks)
@@ -64,7 +64,7 @@ v2.0.0 → Only if breaking changes needed
 
 ---
 
-## 📊 Current Status (v0.1.1-beta - RELEASED)
+## 📊 Current Status (v0.2.0-beta - RELEASED)
 
 ### ✅ What's Working Now
 
@@ -76,44 +76,54 @@ v2.0.0 → Only if breaking changes needed
 - ✅ Git-Flow workflow, Kanban task management
 - ✅ Production-quality code (golangci-lint: 0 issues)
 
-**Reader Implementation** (85%):
+**Reader Implementation** (100%):
 - ✅ Format auto-detection (v5/v7.3)
 - ✅ `Open(io.Reader)` public API
 - ✅ Type system (Variable, DataType, NumericArray)
 - ✅ v5 parser: streaming, all numeric types
 - ✅ v73 adapter: HDF5 integration
-- ⚠️ Known bugs: multi-dim arrays read as 1D, multiple vars
-- ❌ Compression, structures/cells (partial)
-
-**Writer Implementation** (55%):
+- ✅ **Parser bugs FIXED** ✨ NEW in v0.2.0-beta
+  - ✅ Multi-dimensional arrays now work correctly
+  - ✅ Multiple variables in one file supported
+  - ✅ Critical tag format detection bug fixed
+- ⚠️ Compression, structures/cells (partial)
+
+**Writer Implementation** (95%):
+- ✅ **v5 Writer COMPLETE** ✨ NEW in v0.2.0-beta
+  - ✅ All numeric types (double, single, int8-64, uint8-64)
+  - ✅ Complex numbers (proper v5 format)
+  - ✅ Multi-dimensional arrays (1D, 2D, 3D, N-D)
+  - ✅ Both endianness (MI/IM)
+  - ✅ Proper 8-byte alignment and padding
 - ✅ v7.3 Writer COMPLETE (HDF5-based)
 - ✅ `Create()`, `WriteVariable()`, `Close()` API
-- ✅ All numeric types (double, single, int8-64, uint8-64)
-- ✅ **Complex numbers (proper MATLAB v7.3 format)** ✨ FIXED in v0.1.1-beta
-- ✅ Multi-dimensional arrays
-- ✅ Round-trip verified: write → read → ✅ PASSED
+- ✅ **Complex numbers (proper MATLAB v7.3 format)** (v0.1.1-beta)
+- ✅ Round-trip verified: write → read → ✅ PASSED (both v5 and v7.3)
 - ✅ 11 test files generated (testdata/)
-- ✅ **Race detector working** (Gentoo WSL2 fix) ✨ NEW in v0.1.1-beta
-- ❌ v5 Writer (TASK-011) - next milestone
+- ✅ **Race detector working** (Gentoo WSL2 fix) (v0.1.1-beta)
+- ⚠️ Character arrays (partial for v5)
 
 **Quality Metrics**:
-- ✅ Test coverage: 48.8% (30 tests, 27 passing, 90%)
+- ✅ Test coverage: 78.5% (main), 51.8% (v5), 48.8% (v73)
+- ✅ Tests: 100% passing (all previously skipped tests fixed)
 - ✅ Linter: 0 errors, 0 warnings
-- ✅ **Race detector: WORKING** (0 races detected) ✨ NEW
+- ✅ **Race detector: WORKING** (0 races detected)
 - ✅ CI/CD: All checks GREEN ✅
 - ✅ Documentation: Comprehensive
 - ✅ API design: 90/100 (2025 Go best practices)
-- ✅ Repository: PUBLIC, Google indexing started
+- ✅ Repository: PUBLIC, Google indexing active
 
 **Known Limitations** (documented in CHANGELOG):
-- ⚠️ Reader bugs: multi-dimensional arrays, multiple variables
-- ❌ v5 Writer not yet implemented
+- ⚠️ Character arrays (partial support for v5 Writer)
 - ❌ Compression not supported
 - ❌ Structures/cells not supported for writing
 
-**Fixed in v0.1.1-beta**:
-- ✅ Complex numbers now use proper MATLAB v7.3 format (group with nested datasets)
-- ✅ Race detector now works in Gentoo WSL2 (external linkmode fix)
+**Fixed in v0.2.0-beta**:
+- ✅ v5 Writer fully implemented (565 lines)
+- ✅ Critical parser bug fixed (tag format detection)
+- ✅ Multi-dimensional arrays working in reader
+- ✅ Multiple variables per file working in reader
+- ✅ All round-trip tests passing (100%)
 
 ---
 
@@ -140,6 +150,35 @@ v2.0.0 → Only if breaking changes needed
 
 ---
 
+### **Phase 2: v0.2.0-beta - v5 Writer + Parser Fixes** ✅ COMPLETE
+
+**Goal**: Complete MATLAB v5 format writer and fix critical parser bugs
+
+**Deliverables**:
+1. ✅ v5 Writer implementation (565 lines core code)
+2. ✅ Comprehensive unit tests (589 lines, 17+ test functions)
+3. ✅ Round-trip tests (430 lines, v5 write → read → verify)
+4. ✅ Critical parser bug fix (tag format detection)
+5. ✅ Multi-dimensional arrays support in reader
+6. ✅ Multiple variables per file support in reader
+7. ✅ Both endianness support (MI/IM)
+8. ✅ All numeric types + complex numbers for v5
+9. ✅ Documentation updates (README, CHANGELOG, ROADMAP)
+10. ✅ Production quality: 0 linter issues, all tests passing
+
+**Tasks**: TASK-011 (v5 Writer + Parser Fixes)
+**Duration**: 3 days (2025-11-04 to 2025-11-06)
+**Status**: ✅ RELEASED 2025-11-06
+
+**Key Achievements**:
+- v5 Writer implementation: 565 lines of production code
+- Parser bug fix: Single critical fix resolved 3 major bugs
+- Test quality: 100% passing, 78.5% coverage (main package)
+- Code quality: 0 linter errors, professional Go code
+- Round-trip verification: Both v5 and v7.3 formats working perfectly
+
+---
+
 ### **Phase 1.1: v0.1.1-beta - Complex Format Fix** ✅ COMPLETE
 
 **Goal**: Fix complex number format and race detector
@@ -321,46 +360,45 @@ v2.0.0 → Only if breaking changes needed
 
 ---
 
-## 🎯 Current Focus (Post v0.1.0-beta)
+## 🎯 Current Focus (Post v0.2.0-beta)
 
-### Immediate Priorities (Next 1-2 Weeks)
+### Immediate Priorities (Next 2-3 Weeks)
 
-**Decision Point**: Wait for HDF5 v0.11.5-beta or start v5 Writer?
-- **Option A**: Wait 1-2 weeks for HDF5 proper complex format → v0.1.1-beta
-- **Option B**: Start v5 Writer now → v0.2.0 (3-4 weeks)
+**Focus**: v0.3.0 - Functional Options Pattern + Quality Improvements
 
-**Meanwhile**:
-1. **Community Engagement** ⭐
+**Planned Work**:
+1. **API Enhancement** ⭐
+   - Functional Options Pattern (TASK-012)
+   - `WithCompression()`, `WithEndianness()` options
+   - Backward-compatible API improvements
+   - Context Support (TASK-013) - cancellable operations
+
+2. **Community Engagement** ⭐
    - Monitor GitHub issues
    - Respond to questions
    - Gather feature requests
-   - Collect feedback on API
-
-2. **Bug Fixes** ⭐
-   - Fix reader: multi-dimensional arrays read as 1D
-   - Fix reader: can't read files with multiple datasets
-   - Improve error messages
-   - Add more examples
+   - Collect feedback on v0.2.0-beta API
 
 3. **Documentation** ⭐
    - Add more examples to README
    - Create tutorial / getting started guide
    - API reference documentation
    - Performance tips
 
-4. **HDF5 Collaboration** ⭐
-   - Respond to HDF5 team questions
-   - Provide test files for their testing
-   - Test their v0.11.5-beta when ready
+4. **Quality Improvements** ⭐
+   - Increase test coverage to 80%+
+   - Add more edge case tests
+   - Performance benchmarks
+   - Memory optimization
 
 ---
 
 ## 📖 Dependencies
 
 **Required**:
 - Go 1.25+
-- github.com/scigolib/hdf5 v0.11.4-beta (for v7.3 support)
-  - Future: v0.11.5-beta will add proper complex format support
+- github.com/scigolib/hdf5 v0.11.5-beta (for v7.3 support)
+  - Includes nested datasets and group attributes support
 
 **Development**:
 - golangci-lint v2.5+ (code quality)