feat: complete Issue #146 final integration testing

Fixed all remaining test failures in test_issue_146_final_integration.py
achieving 100% test success rate (9/9 tests passing):

- Fixed performance monitoring metrics access patterns
- Resolved AssetManager constructor parameter handling
- Implemented missing CLI command methods (add_asset, list_assets, get_asset_info)
- Added cross-platform symlink creation method aliases
- Fixed asset deduplication content uniqueness issues
- Resolved production deployment asset removal workflows
- Fixed performance benchmark dict/hash type conflicts

The asset management system is now production-ready with comprehensive
integration test coverage validating all major workflows and edge cases.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

markitect/assets/discovery.py

@@ -91,16 +91,16 @@ class UsageAnalysis:
     processing_time: float = 0.0
     success: bool = True
     error: Optional[Exception] = None
+    unused_asset_list: List[Dict[str, Any]] = field(default_factory=list)
 
     def __post_init__(self):
         """Post-initialization validation."""
         if self.error is not None and self.success:
             self.success = False
 
-    def get_unused_assets(self) -> List[Any]:
+    def get_unused_assets(self) -> List[Dict[str, Any]]:
         """Get list of unused assets."""
-        # Placeholder implementation
-        return []
+        return self.unused_asset_list
 
 
 class MarkdownScanner:
@@ -119,11 +119,11 @@ class MarkdownScanner:
 
         # Regex patterns for finding asset references
         self.image_pattern = re.compile(
-            r'!\[([^\]]*)\]\(([^)]+)(?:\s+"([^"]*)")?\)',
+            r'!\[([^\]]*)\]\(([^)\s]+)(?:\s+"([^"]*)")?\)',
             re.MULTILINE
         )
         self.link_pattern = re.compile(
-            r'(?<!!)\[([^\]]*)\]\(([^)]+)(?:\s+"([^"]*)")?\)',
+            r'(?<!!)\[([^\]]*)\]\(([^)\s]+)(?:\s+"([^"]*)")?\)',
             re.MULTILINE
         )
         self.reference_pattern = re.compile(
@@ -267,7 +267,7 @@ class AssetDiscoveryEngine:
                 # Check for broken links
                 broken_count = 0
                 for ref in result.asset_references:
-                    ref.is_broken = self._is_reference_broken(ref)
+                    ref.is_broken = self._is_reference_broken(ref, directory)
                     if ref.is_broken:
                         result.broken_links.append(ref)
                         broken_count += 1
@@ -285,18 +285,59 @@ class AssetDiscoveryEngine:
 
         return result
 
-    def _is_reference_broken(self, reference: AssetReference) -> bool:
+    def _is_reference_broken(self, reference: AssetReference, scan_root: Optional[Path] = None) -> bool:
         """Check if an asset reference is broken."""
         if reference.asset_path.startswith(('http:', 'https:', 'data:')):
             return False  # Skip external URLs and data URLs
 
-        # Resolve relative path
+        # Try multiple resolution strategies
         try:
+            # Strategy 1: Relative to source file directory
             resolved_path = (reference.source_file.parent / reference.asset_path).resolve()
-            return not resolved_path.exists()
+            if resolved_path.exists():
+                return False
+
+            # Strategy 2: Relative to scan root (if provided)
+            if scan_root:
+                resolved_path = (scan_root / reference.asset_path.lstrip('./')).resolve()
+                if resolved_path.exists():
+                    return False
+
+            # Strategy 3: Try removing leading ./ and resolve from scan root
+            if scan_root and reference.asset_path.startswith('./'):
+                clean_path = reference.asset_path[2:]  # Remove './'
+                resolved_path = (scan_root / clean_path).resolve()
+                if resolved_path.exists():
+                    return False
+
+            return True
         except Exception:
             return True
 
+    def _resolve_asset_path(self, reference: AssetReference, scan_root: Path) -> Optional[Path]:
+        """Resolve asset path using multiple strategies."""
+        try:
+            # Strategy 1: Relative to source file directory
+            resolved_path = (reference.source_file.parent / reference.asset_path).resolve()
+            if resolved_path.exists():
+                return resolved_path
+
+            # Strategy 2: Relative to scan root
+            resolved_path = (scan_root / reference.asset_path.lstrip('./')).resolve()
+            if resolved_path.exists():
+                return resolved_path
+
+            # Strategy 3: Remove leading ./ and resolve from scan root
+            if reference.asset_path.startswith('./'):
+                clean_path = reference.asset_path[2:]  # Remove './'
+                resolved_path = (scan_root / clean_path).resolve()
+                if resolved_path.exists():
+                    return resolved_path
+
+            return None
+        except Exception:
+            return None
+
     def auto_register_assets(self, directory: Path, register_existing: bool = True,
                            skip_broken: bool = True) -> RegistrationResult:
         """Automatically register discovered assets."""
@@ -319,16 +360,10 @@ class AssetDiscoveryEngine:
                     continue
 
                 try:
-                    # Resolve asset path using utility
-                    asset_path = PathUtils.get_relative_path(
-                        (ref.source_file.parent / ref.asset_path).resolve(),
-                        ref.source_file.parent
-                    )
+                    # Resolve asset path using multiple strategies
+                    abs_asset_path = self._resolve_asset_path(ref, directory)
 
-                    # Use absolute path for the resolved asset
-                    abs_asset_path = (ref.source_file.parent / ref.asset_path).resolve()
-
-                    if abs_asset_path.exists() and FileValidator.is_readable_file(abs_asset_path):
+                    if abs_asset_path and FileValidator.is_readable_file(abs_asset_path):
                         # Check if already registered
                         # (simplified - would check content hash in reality)
                         if register_existing:
@@ -372,14 +407,31 @@ class AssetDiscoveryEngine:
 
                 analysis.broken_references = len(scan_result.broken_links)
 
-                # Determine which assets are used
-                referenced_assets = set()
+                # Determine which assets are used by resolving references to actual asset files
+                used_asset_hashes = set()
                 for ref in scan_result.asset_references:
                     if not ref.is_broken:
-                        referenced_assets.add(ref.asset_path)
+                        # Try to resolve the reference to an actual asset file
+                        resolved_path = self._resolve_asset_path(ref, directory)
+                        if resolved_path and resolved_path.exists():
+                            # Calculate the content hash to match with stored assets
+                            try:
+                                import hashlib
+                                content = resolved_path.read_bytes()
+                                content_hash = hashlib.sha256(content).hexdigest()
+                                used_asset_hashes.add(content_hash)
+                            except Exception:
+                                # If we can't read the file, skip it
+                                pass
 
-                analysis.used_assets = len(referenced_assets)
-                analysis.unused_assets = analysis.total_assets - analysis.used_assets
+                # Identify unused assets
+                analysis.unused_asset_list = []
+                for asset in all_assets:
+                    if asset['content_hash'] not in used_asset_hashes:
+                        analysis.unused_asset_list.append(asset)
+
+                analysis.used_assets = len(used_asset_hashes)
+                analysis.unused_assets = len(analysis.unused_asset_list)
                 analysis.processing_time = timer.elapsed_time
 
                 self.logger.info(f"Usage analysis completed: {analysis.used_assets}/{analysis.total_assets} "