feat: enhancement workflow preset system with multi-target CLI

- Add YAML-based enhancement workflow presets shipped inside the package
  (default, minimal, security-focus, architecture-comprehensive, api-documentation)
- Add `skill-seekers workflows` subcommand: list, show, copy, add, remove, validate
- copy/add/remove all accept multiple names/files in one invocation with partial-failure behaviour
- `add --name` override restricted to single-file operations
- Add 5 MCP tools: list_workflows, get_workflow, create_workflow, update_workflow, delete_workflow
- Fix: create command _add_common_args() now correctly forwards each --enhance-workflow
  as a separate flag instead of passing the whole list as a single argument
- Update README: reposition as "data layer for AI systems" with AI Skills front and centre
- Update CHANGELOG, QUICK_REFERENCE, CLAUDE.md with workflow preset details
- 1,880+ tests passing

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

tests/test_create_integration_basic.py

@@ -117,6 +117,134 @@ class TestCreateCommandBasic:
         assert "--dry-run" in result.stdout
 
 
+class TestCreateCommandArgvForwarding:
+    """Unit tests for _add_common_args argv forwarding."""
+
+    def _make_args(self, **kwargs):
+        import argparse
+        defaults = dict(
+            enhance_workflow=None,
+            enhance_stage=None,
+            var=None,
+            workflow_dry_run=False,
+            enhance_level=0,
+            output=None,
+            name=None,
+            description=None,
+            config=None,
+            api_key=None,
+            dry_run=False,
+            verbose=False,
+            quiet=False,
+            chunk_for_rag=False,
+            chunk_size=512,
+            chunk_overlap=50,
+            preset=None,
+            no_preserve_code_blocks=False,
+            no_preserve_paragraphs=False,
+            interactive_enhancement=False,
+        )
+        defaults.update(kwargs)
+        return argparse.Namespace(**defaults)
+
+    def _collect_argv(self, args):
+        from skill_seekers.cli.create_command import CreateCommand
+        cmd = CreateCommand(args)
+        argv = []
+        cmd._add_common_args(argv)
+        return argv
+
+    def test_single_enhance_workflow_forwarded(self):
+        args = self._make_args(enhance_workflow=["security-focus"])
+        argv = self._collect_argv(args)
+        assert argv.count("--enhance-workflow") == 1
+        assert "security-focus" in argv
+
+    def test_multiple_enhance_workflows_all_forwarded(self):
+        """Each workflow must appear as a separate --enhance-workflow flag."""
+        args = self._make_args(enhance_workflow=["security-focus", "minimal"])
+        argv = self._collect_argv(args)
+        assert argv.count("--enhance-workflow") == 2
+        idx1 = argv.index("security-focus")
+        idx2 = argv.index("minimal")
+        assert argv[idx1 - 1] == "--enhance-workflow"
+        assert argv[idx2 - 1] == "--enhance-workflow"
+
+    def test_no_enhance_workflow_not_forwarded(self):
+        args = self._make_args(enhance_workflow=None)
+        argv = self._collect_argv(args)
+        assert "--enhance-workflow" not in argv
+
+    # ── enhance_stage ────────────────────────────────────────────────────────
+
+    def test_single_enhance_stage_forwarded(self):
+        args = self._make_args(enhance_stage=["security:Check for vulnerabilities"])
+        argv = self._collect_argv(args)
+        assert "--enhance-stage" in argv
+        assert "security:Check for vulnerabilities" in argv
+
+    def test_multiple_enhance_stages_all_forwarded(self):
+        stages = ["sec:Check security", "cleanup:Remove boilerplate"]
+        args = self._make_args(enhance_stage=stages)
+        argv = self._collect_argv(args)
+        assert argv.count("--enhance-stage") == 2
+        for stage in stages:
+            assert stage in argv
+
+    def test_enhance_stage_none_not_forwarded(self):
+        args = self._make_args(enhance_stage=None)
+        argv = self._collect_argv(args)
+        assert "--enhance-stage" not in argv
+
+    # ── var ──────────────────────────────────────────────────────────────────
+
+    def test_single_var_forwarded(self):
+        args = self._make_args(var=["depth=comprehensive"])
+        argv = self._collect_argv(args)
+        assert "--var" in argv
+        assert "depth=comprehensive" in argv
+
+    def test_multiple_vars_all_forwarded(self):
+        args = self._make_args(var=["depth=comprehensive", "focus=security"])
+        argv = self._collect_argv(args)
+        assert argv.count("--var") == 2
+        assert "depth=comprehensive" in argv
+        assert "focus=security" in argv
+
+    def test_var_none_not_forwarded(self):
+        args = self._make_args(var=None)
+        argv = self._collect_argv(args)
+        assert "--var" not in argv
+
+    # ── workflow_dry_run ─────────────────────────────────────────────────────
+
+    def test_workflow_dry_run_forwarded(self):
+        args = self._make_args(workflow_dry_run=True)
+        argv = self._collect_argv(args)
+        assert "--workflow-dry-run" in argv
+
+    def test_workflow_dry_run_false_not_forwarded(self):
+        args = self._make_args(workflow_dry_run=False)
+        argv = self._collect_argv(args)
+        assert "--workflow-dry-run" not in argv
+
+    # ── mixed ────────────────────────────────────────────────────────────────
+
+    def test_workflow_and_stage_both_forwarded(self):
+        args = self._make_args(
+            enhance_workflow=["security-focus"],
+            enhance_stage=["cleanup:Remove boilerplate"],
+            var=["depth=basic"],
+            workflow_dry_run=True,
+        )
+        argv = self._collect_argv(args)
+        assert "--enhance-workflow" in argv
+        assert "security-focus" in argv
+        assert "--enhance-stage" in argv
+        assert "--var" in argv
+        assert "--workflow-dry-run" in argv
+
+
 class TestBackwardCompatibility:
     """Test that old commands still work."""
 
@@ -165,3 +293,16 @@ class TestBackwardCompatibility:
         assert "scrape" in result.stdout
         assert "github" in result.stdout
         assert "analyze" in result.stdout
+
+    def test_workflows_command_still_works(self):
+        """The new workflows subcommand is accessible via the main CLI."""
+        import subprocess
+
+        result = subprocess.run(
+            ["skill-seekers", "workflows", "--help"],
+            capture_output=True,
+            text=True,
+            timeout=10,
+        )
+        assert result.returncode == 0
+        assert "workflow" in result.stdout.lower()