chore: Release v2.8.0

Major feature release with enhanced code analysis and documentation.

Features:
- C3.9: Project documentation extraction
- Granular AI enhancement control (--enhance-level 0-3)
- C# language support for test extraction
- 6-12x faster parallel LOCAL mode AI enhancement
- Auto-enhancement and LOCAL mode fallbacks
- GLM-4.7 and custom Claude-compatible API support

Bug Fixes:
- Fixed C# test extraction language errors
- Fixed config type field mismatch
- Fixed LocalSkillEnhancer import issues
- Fixed critical linter errors

Contributors:
- @xuintl - Chinese README improvements
- @Zhichang Yu - GLM-4.7 support and PDF fixes
- @YusufKaraaslanSpyke - Core features and maintenance

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/skill_seekers/_version.py

@@ -24,11 +24,11 @@ def get_version() -> str:
     Read version from pyproject.toml.
 
     Returns:
-        Version string (e.g., "2.7.4")
+        Version string (e.g., "2.8.0")
     """
     if tomllib is None:
         # Fallback if TOML library not available
-        return "2.7.4"  # Hardcoded fallback
+        return "2.8.0"  # Hardcoded fallback
 
     try:
         # Get path to pyproject.toml (3 levels up from this file)
@@ -37,7 +37,7 @@ def get_version() -> str:
 
         if not pyproject_path.exists():
             # Fallback for installed package
-            return "2.7.4"  # Hardcoded fallback
+            return "2.8.0"  # Hardcoded fallback
 
         with open(pyproject_path, "rb") as f:
             pyproject_data = tomllib.load(f)
@@ -46,7 +46,7 @@ def get_version() -> str:
 
     except Exception:
         # Fallback if anything goes wrong
-        return "2.7.4"  # Hardcoded fallback
+        return "2.8.0"  # Hardcoded fallback
 
 
 __version__ = get_version()