fix: pass commit_id to metadata.json in CLI mode for --update support

Previously, CLIDocumentationGenerator never received or forwarded the
git commit SHA, so metadata.json always had commit_id: null. This made
--update fall back to full regeneration every time. Now the commit hash
is obtained before generator creation and threaded through to the
backend DocumentationGenerator, matching the behavior already present
in Web mode (background_worker.py).

Author: mambo-wang

codewiki/cli/adapters/doc_generator.py

@@ -37,7 +37,8 @@ def __init__(
         output_dir: Path,
         config: Dict[str, Any],
         verbose: bool = False,
-        generate_html: bool = False
+        generate_html: bool = False,
+        commit_id: str = None,
     ):
         """
         Initialize the CLI documentation generator.
@@ -48,12 +49,14 @@ def __init__(
             config: LLM configuration
             verbose: Enable verbose output
             generate_html: Whether to generate HTML viewer
+            commit_id: Git commit SHA for incremental update tracking
         """
         self.repo_path = repo_path
         self.output_dir = output_dir
         self.config = config
         self.verbose = verbose
         self.generate_html = generate_html
+        self.commit_id = commit_id
         self.progress_tracker = ProgressTracker(total_stages=5, verbose=verbose)
         self.job = DocumentationJob()
 
@@ -178,7 +181,7 @@ async def _run_backend_generation(self, backend_config: BackendConfig):
             self.progress_tracker.update_stage(0.2, "Initializing dependency analyzer...")
 
         # Create documentation generator
-        doc_generator = DocumentationGenerator(backend_config)
+        doc_generator = DocumentationGenerator(backend_config, commit_id=self.commit_id)
 
         if self.verbose:
             self.progress_tracker.update_stage(0.5, "Parsing source files...")

codewiki/cli/commands/generate.py

@@ -525,6 +525,8 @@ def generate_command(
             agent_instructions_dict = config.agent_instructions.to_dict()
 
         # Create generator
+        # Get commit_id early so it can be stored in metadata.json for --update support
+        commit_id = get_git_commit_hash(repo_path)
         generator = CLIDocumentationGenerator(
             repo_path=repo_path,
             output_dir=output_dir,
@@ -545,7 +547,8 @@ def generate_command(
                 'max_depth': max_depth if max_depth is not None else config.max_depth,
             },
             verbose=verbose,
-            generate_html=github_pages
+            generate_html=github_pages,
+            commit_id=commit_id,
         )
 
         # Run generation
@@ -556,7 +559,6 @@ def generate_command(
 
         # Get repository info
         repo_url = None
-        commit_hash = get_git_commit_hash(repo_path)
         current_branch = get_git_branch(repo_path)
 
         if is_git_repository(repo_path):