chore: Consolidate as v0.8.0 release

Consolidates all features (Impact Classification, Whitespace Intelligence,
and Multi-TFM Support) into v0.8.0 release since v0.8.0 was never published.

Changes:
- Updated CHANGELOG.md: Changed [0.9.0] to [0.8.0]
- Expanded v0.8.0 section to include all three major features
- Updated README.md: Changed all v0.9.0 references to v0.8.0
- Updated docs/tfm-support.md: Changed version to 0.8.0+

This release includes:
- Impact Classification (v0.7.0 features)
- Whitespace Intelligence (v0.8.0 features)
- Multi-Target Framework Support (previously v0.9.0)

Ready for v0.8.0 release to main.

Author: randlee

CHANGELOG.md

@@ -13,46 +13,81 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Git integration (compare commits, branches)
 - F# support via FSharp.Compiler.Service
 
-## [0.9.0] - 2026-01-20
+## [0.8.0] - 2026-01-20
 
 ### Added
 
+#### Impact Classification
+- **Automatic Impact Classification** - Every change is categorized by its potential impact on consumers
+  - Breaking Public API - Changes that break external consumers (method signature changes, removed public members)
+  - Breaking Internal API - Changes that break internal consumers (internal method renames, parameter changes)
+  - Non-Breaking - Safe changes with no execution impact (private field renames, code reordering)
+  - Formatting Only - Pure whitespace/comment changes
+- **Visibility Tracking** - Each change includes visibility information (public, internal, private, protected)
+- **Caveat Warnings** - Warnings for edge cases (e.g., "parameter rename may break named arguments")
+- **Impact Filtering** - Filter changes by impact level in JSON output
+
+#### Whitespace Intelligence
+- **4 Whitespace Modes** - Fine-grained whitespace handling
+  - Exact - Preserve all whitespace (default)
+  - IgnoreLeadingTrailing - Ignore leading/trailing whitespace
+  - IgnoreAll - Ignore all whitespace differences
+  - LanguageAware - Language-specific handling (exact for Python/YAML, normalized for C#/Java)
+- **Automatic Issue Detection** - Detects indentation changes, mixed tabs/spaces, trailing whitespace, line ending changes
+- **Whitespace Warnings** - Visual indicators in HTML output for whitespace issues
+- **CLI Options** - `--whitespace-mode` and `-w` shortcut for `--whitespace-mode ignore-all`
+
 #### Multi-Target Framework (Multi-TFM) Support
 - **Target Framework Analysis** - Analyze code differences across multiple .NET target frameworks simultaneously
 - **TFM-Specific Change Detection** - Identify which changes apply to specific target frameworks vs. all frameworks
 - **Conditional Compilation Awareness** - Properly handles `#if` directives and framework-specific code
 - **Per-TFM Semantic Analysis** - Runs full Roslyn analysis for each target framework with correct compilation symbols
+- **Parallel TFM Processing** - Optimized multi-TFM analysis with parallel processing
 
 #### CLI Enhancements
+- `--impact-level` - Filter by impact: `breaking-public`, `breaking-internal`, `non-breaking`, `all`
+- `--include-non-impactful` - Include non-breaking and formatting changes in JSON output
+- `--include-formatting` - Include formatting-only changes
+- `--whitespace-mode` - Whitespace handling mode
 - `--target-framework` / `-t` - Specify one or more target frameworks for analysis (can be repeated)
 - `-T` / `--target-frameworks` - Specify semicolon-separated list of target frameworks (e.g., "net8.0;net10.0")
 - TFM validation with helpful error messages for invalid framework identifiers
 - Support for common TFM formats: `net8.0`, `net10.0`, `netcoreapp3.1`, `netstandard2.0`, `net462`, etc.
 
 #### Output Format Enhancements
-- **JSON Output** - Added `targetFrameworks` array in metadata and `applicableToTfms` per change
-- **HTML Output** - Displays target frameworks in summary and annotates TFM-specific changes
-- **Text/Plain Output** - Shows TFM annotations like `[.NET 8.0]` for framework-specific changes
-- **Terminal Output** - Rich display of multi-framework analysis results
+- **Impact Indicators** - Color-coded impact badges in HTML, impact properties in JSON
+- **Whitespace Warnings** - Visual indicators for whitespace issues in HTML output
+- **TFM Annotations** - Target framework information in all output formats
+  - JSON: `targetFrameworks` array in metadata and `applicableToTfms` per change
+  - HTML: TFM badges and framework-specific indicators
+  - Text/Plain: TFM annotations like `[.NET 8.0]` for framework-specific changes
 
 #### Architecture Improvements
+- `ImpactClassifier` - Analyzes and classifies change impact
+- `WhitespaceAnalyzer` - Detects whitespace issues
+- `TfmSymbolResolver` - Maps TFMs to preprocessor symbols
+- `TfmParser` - Validates and parses TFM strings
+- `PreprocessorDirectiveDetector` - Pre-scan optimization for conditional compilation
 - `TfmResultMerger` - Intelligent merging of per-TFM analysis results
-- `TfmChangeCorrelator` - Correlates changes across TFMs to identify commonalities
-- Enhanced `DiffResult` model with `TargetFrameworks` and per-change `ApplicableToTfms`
-- Optimized multi-TFM analysis with parallel processing
+- Enhanced `DiffResult` model with impact breakdown and TFM metadata
+- Enhanced `Change` model with `Impact`, `Visibility`, `Caveats`, and `ApplicableToTfms` properties
 
 #### Documentation
-- Comprehensive TFM support guide (`docs/tfm-support.md`)
-- Sample files demonstrating conditional compilation scenarios
-- Usage examples for single and multiple framework analysis
+- **Impact Classification Guide** (`docs/impact-classification.md`) - Complete guide to impact levels, filtering, and use cases
+- **Whitespace Handling Guide** (`docs/whitespace-handling.md`) - Whitespace modes and best practices
+- **Multi-TFM Support Guide** (`docs/tfm-support.md`) - Multi-target framework analysis and conditional compilation
+- Sample files demonstrating TFM scenarios and whitespace handling
+- Updated API documentation with programmatic examples
 
 ### Changed
-- Enhanced `DiffOptions` with `TargetFrameworks` property
-- Updated all output formatters to handle TFM metadata
-- Improved error messages for TFM-related validation failures
+- Enhanced `DiffOptions` with `ImpactLevel`, `IncludeNonImpactful`, `IncludeFormatting`, `WhitespaceMode`, and `TargetFrameworks` properties
+- Updated all output formatters to display impact, whitespace warnings, and TFM metadata
+- JSON output defaults to showing only breaking changes (`IncludeNonImpactful: false`)
+- HTML output defaults to showing all changes for review
 
 ### Performance
 - Multi-TFM overhead is minimal (~2-2.5x for 3 frameworks vs. single framework)
+- Pre-scan optimization skips multi-TFM analysis when no `#if` directives exist
 - Parallel TFM processing where possible
 - Efficient change correlation algorithms
 

README.md

@@ -45,7 +45,7 @@ Fine-grained whitespace handling with language-aware detection:
 
 See [Whitespace Handling Guide](docs/whitespace-handling.md) for comprehensive details.
 
-### Multi-Target Framework Analysis (v0.9.0) 🎯
+### Multi-Target Framework Analysis (v0.8.0) 🎯
 
 Analyze code changes across multiple .NET target frameworks simultaneously:
 
@@ -207,7 +207,7 @@ roslyn-diff diff <old-file> <new-file> [options]
 | `--whitespace-mode <mode>` | | Whitespace handling: `exact`, `ignore-leading-trailing`, `ignore-all`, `language-aware` | `exact` |
 | `--ignore-whitespace` | `-w` | Shortcut for `--whitespace-mode ignore-all` | `false` |
 
-**Multi-TFM Options (v0.9.0):**
+**Multi-TFM Options (v0.8.0):**
 | Option | Short | Description | Default |
 |--------|-------|-------------|---------|
 | `--target-framework <tfm>` | `-t` | Target framework moniker (repeatable: `-t net8.0 -t net10.0`) | `null` (NET10_0 assumed) |
@@ -284,7 +284,7 @@ roslyn-diff diff old.cs new.cs --json analysis.json
 {
   "$schema": "roslyn-diff-output-v2",
   "metadata": {
-    "version": "0.9.0",
+    "version": "0.8.0",
     "timestamp": "2026-01-19T22:45:12Z",
     "mode": "roslyn",
     "analyzedTfms": ["net8.0", "net10.0"],
@@ -568,7 +568,7 @@ See the [Synaptic Canvas documentation](https://github.com/randlee/synaptic-canv
 
 - **[Impact Classification Guide](docs/impact-classification.md)** - Complete guide to impact levels, filtering, caveats, and use cases (v0.7.0)
 - **[Whitespace Handling Guide](docs/whitespace-handling.md)** - Whitespace modes, language-aware detection, and best practices (v0.8.0)
-- **[Multi-TFM Support Guide](docs/tfm-support.md)** - Multi-target framework analysis, conditional compilation detection, and advanced scenarios (v0.9.0)
+- **[Multi-TFM Support Guide](docs/tfm-support.md)** - Multi-target framework analysis, conditional compilation detection, and advanced scenarios (v0.8.0)
 - [Output Formats](docs/output-formats.md) - Format specifications, JSON Schema v2, and feature comparison
 - [Sample Outputs](samples/README.md) - Example diffs with impact classification
 

docs/tfm-support.md

@@ -1,6 +1,6 @@
 # Multi-Target Framework Support Guide
 
-**Version:** 0.9.0+
+**Version:** 0.8.0+
 **Last Updated:** January 2026
 
 roslyn-diff includes comprehensive support for analyzing code changes across multiple .NET target frameworks (TFMs). This allows developers to understand how changes behave differently across framework versions, particularly when using conditional compilation (`#if`, `#elif`) or framework-specific APIs.
@@ -389,7 +389,7 @@ Multi-TFM information appears in two places:
 {
   "$schema": "roslyn-diff-output-v2",
   "metadata": {
-    "version": "0.9.0",
+    "version": "0.8.0",
     "analyzedTfms": ["net8.0", "net10.0"],
     "options": {
       "targetFrameworks": ["net8.0", "net10.0"]