feat(C2.6): Add dependency graph support to MCP scrape_codebase tool

- Add build_dependency_graph parameter to scrape_codebase MCP tool
- Update tool documentation with new parameter
- Pass --build-dependency-graph flag to CLI command
- Update FastMCP server function signature

Usage via MCP:
  scrape_codebase(
      directory="/path/to/repo",
      build_dependency_graph=True
  )

This completes the C2.6 feature set by exposing dependency graph
generation through the MCP interface, making it available to all
MCP clients (Claude Code, Cursor, etc.).

src/skill_seekers/mcp/server_fastmcp.py

@@ -396,7 +396,7 @@ async def scrape_pdf(
 
 
 @safe_tool_decorator(
-    description="Analyze local codebase and extract code knowledge. Walks directory tree, analyzes code files, extracts signatures, docstrings, and optionally generates API reference documentation."
+    description="Analyze local codebase and extract code knowledge. Walks directory tree, analyzes code files, extracts signatures, docstrings, and optionally generates API reference documentation and dependency graphs."
 )
 async def scrape_codebase(
     directory: str,
@@ -405,6 +405,7 @@ async def scrape_codebase(
     languages: str = "",
     file_patterns: str = "",
     build_api_reference: bool = False,
+    build_dependency_graph: bool = False,
 ) -> str:
     """
     Analyze local codebase and extract code knowledge.
@@ -416,6 +417,7 @@ async def scrape_codebase(
         languages: Comma-separated languages to analyze (e.g., "Python,JavaScript,C++")
         file_patterns: Comma-separated file patterns (e.g., "*.py,src/**/*.js")
         build_api_reference: Generate API reference markdown (default: false)
+        build_dependency_graph: Generate dependency graph and detect circular dependencies (default: false)
 
     Returns:
         Codebase analysis results with file paths.
@@ -427,6 +429,7 @@ async def scrape_codebase(
         "languages": languages,
         "file_patterns": file_patterns,
         "build_api_reference": build_api_reference,
+        "build_dependency_graph": build_dependency_graph,
     }
 
     result = await scrape_codebase_impl(args)

src/skill_seekers/mcp/tools/scraping_tools.py

@@ -438,7 +438,8 @@ async def scrape_codebase_tool(args: dict) -> List[TextContent]:
     Analyze local codebase and extract code knowledge.
 
     Walks directory tree, analyzes code files, extracts signatures,
-    docstrings, and optionally generates API reference documentation.
+    docstrings, and optionally generates API reference documentation
+    and dependency graphs.
 
     Args:
         args: Dictionary containing:
@@ -448,6 +449,7 @@ async def scrape_codebase_tool(args: dict) -> List[TextContent]:
             - languages (str, optional): Comma-separated languages (e.g., "Python,JavaScript,C++")
             - file_patterns (str, optional): Comma-separated file patterns (e.g., "*.py,src/**/*.js")
             - build_api_reference (bool, optional): Generate API reference markdown (default: False)
+            - build_dependency_graph (bool, optional): Generate dependency graph and detect circular dependencies (default: False)
 
     Returns:
         List[TextContent]: Tool execution results
@@ -456,7 +458,8 @@ async def scrape_codebase_tool(args: dict) -> List[TextContent]:
         scrape_codebase(
             directory="/path/to/repo",
             depth="deep",
-            build_api_reference=True
+            build_api_reference=True,
+            build_dependency_graph=True
         )
     """
     directory = args.get("directory")
@@ -468,6 +471,7 @@ async def scrape_codebase_tool(args: dict) -> List[TextContent]:
     languages = args.get("languages", "")
     file_patterns = args.get("file_patterns", "")
     build_api_reference = args.get("build_api_reference", False)
+    build_dependency_graph = args.get("build_dependency_graph", False)
 
     # Build command
     cmd = [sys.executable, "-m", "skill_seekers.cli.codebase_scraper"]
@@ -483,6 +487,8 @@ async def scrape_codebase_tool(args: dict) -> List[TextContent]:
         cmd.extend(["--file-patterns", file_patterns])
     if build_api_reference:
         cmd.append("--build-api-reference")
+    if build_dependency_graph:
+        cmd.append("--build-dependency-graph")
 
     timeout = 600  # 10 minutes for codebase analysis