feat: add CONFIG_ARGUMENTS and fix _route_config for unified scraper parity

Previously _route_config only forwarded --dry-run, silently dropping
all enhancement workflows, --merge-mode, and --skip-codebase-analysis.

Changes:
- arguments/create.py: add CONFIG_ARGUMENTS dict with merge_mode and
  skip_codebase_analysis; wire into get_source_specific_arguments(),
  get_compatible_arguments(), and add_create_arguments(mode='config')
- create_command.py: fix _route_config to forward --fresh, --merge-mode,
  --skip-codebase-analysis, and all 4 workflow flags; add --help-config
  handler (skill-seekers create --help-config) matching other help modes
- parsers/create_parser.py: add --help-config flag for unified CLI parity
- tests/test_create_arguments.py: import CONFIG_ARGUMENTS; update config
  source tests to assert correct content instead of empty dict

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/skill_seekers/cli/arguments/create.py

@@ -389,6 +389,28 @@ PDF_ARGUMENTS: dict[str, dict[str, Any]] = {
     },
 }
 
+# Multi-source config specific (from unified_scraper.py)
+CONFIG_ARGUMENTS: dict[str, dict[str, Any]] = {
+    "merge_mode": {
+        "flags": ("--merge-mode",),
+        "kwargs": {
+            "type": str,
+            "choices": ["rule-based", "claude-enhanced"],
+            "help": "Override merge mode from config (rule-based or claude-enhanced)",
+            "metavar": "MODE",
+        },
+    },
+    "skip_codebase_analysis": {
+        "flags": ("--skip-codebase-analysis",),
+        "kwargs": {
+            "action": "store_true",
+            "help": "Skip C3.x codebase analysis for GitHub sources in unified config",
+        },
+    },
+    # Note: --fresh is intentionally omitted here — it already lives in WEB_ARGUMENTS.
+    # For unified config files, use `skill-seekers unified --fresh` directly.
+}
+
 # =============================================================================
 # TIER 3: ADVANCED/RARE ARGUMENTS
 # =============================================================================
@@ -449,7 +471,7 @@ def get_source_specific_arguments(source_type: str) -> dict[str, dict[str, Any]]
         "github": GITHUB_ARGUMENTS,
         "local": LOCAL_ARGUMENTS,
         "pdf": PDF_ARGUMENTS,
-        "config": {},  # Config files don't have extra args
+        "config": CONFIG_ARGUMENTS,
     }
     return source_args.get(source_type, {})
 
@@ -521,6 +543,10 @@ def add_create_arguments(parser: argparse.ArgumentParser, mode: str = "default")
         for arg_name, arg_def in PDF_ARGUMENTS.items():
             parser.add_argument(*arg_def["flags"], **arg_def["kwargs"])
 
+    if mode in ["config", "all"]:
+        for arg_name, arg_def in CONFIG_ARGUMENTS.items():
+            parser.add_argument(*arg_def["flags"], **arg_def["kwargs"])
+
     # Add advanced arguments if requested
     if mode in ["advanced", "all"]:
         for arg_name, arg_def in ADVANCED_ARGUMENTS.items():

src/skill_seekers/cli/create_command.py

@@ -300,16 +300,31 @@ class CreateCommand:
         config_path = self.source_info.parsed["config_path"]
         argv.extend(["--config", config_path])
 
-        # Add only the arguments that unified_scraper actually supports
-        # unified_scraper has its own config format that includes:
-        # name, description, output_dir, enhancement, etc.
-        # So we only pass behavioral flags here:
-
+        # Behavioral flags supported by unified_scraper
+        # Note: name/output/enhance-level come from the JSON config file, not CLI
         if self.args.dry_run:
             argv.append("--dry-run")
+        if getattr(self.args, "fresh", False):
+            argv.append("--fresh")
 
-        # Note: unified_scraper gets name, output, enhancement from config file
-        # not from CLI args. The config format includes these fields.
+        # Config-specific flags (--merge-mode, --skip-codebase-analysis)
+        if getattr(self.args, "merge_mode", None):
+            argv.extend(["--merge-mode", self.args.merge_mode])
+        if getattr(self.args, "skip_codebase_analysis", False):
+            argv.append("--skip-codebase-analysis")
+
+        # Enhancement workflow flags (unified_scraper now supports these)
+        if getattr(self.args, "enhance_workflow", None):
+            for wf in self.args.enhance_workflow:
+                argv.extend(["--enhance-workflow", wf])
+        if getattr(self.args, "enhance_stage", None):
+            for stage in self.args.enhance_stage:
+                argv.extend(["--enhance-stage", stage])
+        if getattr(self.args, "var", None):
+            for var in self.args.var:
+                argv.extend(["--var", var])
+        if getattr(self.args, "workflow_dry_run", False):
+            argv.append("--workflow-dry-run")
 
         # Call unified_scraper with modified argv
         logger.debug(f"Calling unified_scraper with argv: {argv}")
@@ -456,6 +471,9 @@ Common Workflows:
         "--help-local", action="store_true", help=argparse.SUPPRESS, dest="_help_local"
     )
     parser.add_argument("--help-pdf", action="store_true", help=argparse.SUPPRESS, dest="_help_pdf")
+    parser.add_argument(
+        "--help-config", action="store_true", help=argparse.SUPPRESS, dest="_help_config"
+    )
     parser.add_argument(
         "--help-advanced", action="store_true", help=argparse.SUPPRESS, dest="_help_advanced"
     )
@@ -502,6 +520,15 @@ Common Workflows:
         add_create_arguments(parser_pdf, mode="pdf")
         parser_pdf.print_help()
         return 0
+    elif args._help_config:
+        parser_config = argparse.ArgumentParser(
+            prog="skill-seekers create",
+            description="Create skill from multi-source config file (unified scraper)",
+            formatter_class=argparse.RawDescriptionHelpFormatter,
+        )
+        add_create_arguments(parser_config, mode="config")
+        parser_config.print_help()
+        return 0
     elif args._help_advanced:
         parser_advanced = argparse.ArgumentParser(
             prog="skill-seekers create",

src/skill_seekers/cli/parsers/create_parser.py

@@ -83,6 +83,12 @@ Presets: -p quick (1-2min) | -p standard (5-10min) | -p comprehensive (20-60min)
             help="Show PDF extraction specific options",
             dest="_help_pdf",
         )
+        parser.add_argument(
+            "--help-config",
+            action="store_true",
+            help="Show multi-source config file specific options",
+            dest="_help_config",
+        )
         parser.add_argument(
             "--help-advanced",
             action="store_true",

tests/test_create_arguments.py

@@ -12,6 +12,7 @@ from skill_seekers.cli.arguments.create import (
     GITHUB_ARGUMENTS,
     LOCAL_ARGUMENTS,
     PDF_ARGUMENTS,
+    CONFIG_ARGUMENTS,
     ADVANCED_ARGUMENTS,
     get_universal_argument_names,
     get_source_specific_arguments,
@@ -158,9 +159,11 @@ class TestArgumentHelpers:
         assert args == PDF_ARGUMENTS
 
     def test_get_source_specific_config(self):
-        """Config should return empty dict (no extra args)."""
+        """Config should return CONFIG_ARGUMENTS (merge-mode, skip-codebase-analysis)."""
         args = get_source_specific_arguments("config")
-        assert args == {}
+        assert args == CONFIG_ARGUMENTS
+        assert "merge_mode" in args
+        assert "skip_codebase_analysis" in args
 
     def test_get_source_specific_unknown(self):
         """Unknown source should return empty dict."""
@@ -223,16 +226,20 @@ class TestCompatibleArguments:
         assert "ocr" in compatible
 
     def test_config_compatible_arguments(self):
-        """Config source should include universal + advanced only."""
+        """Config source should include universal + config-specific + advanced."""
         compatible = get_compatible_arguments("config")
 
         # Should include universal arguments
         assert "config" in compatible
 
+        # Should include config-specific arguments
+        assert "merge_mode" in compatible
+        assert "skip_codebase_analysis" in compatible
+
         # Should include advanced arguments
         assert "no_preserve_code_blocks" in compatible
 
-        # Should not include source-specific arguments
+        # Should not include other source-specific arguments
         assert "repo" not in compatible
         assert "directory" not in compatible