fix: vendor per-kind sites in the hub; drop stale blog docs

- collect.py: when a kind points at the shared site root, copy only the
  per-kind subdir (site/lib -> <repo>/lib) instead of the whole site, so
  stray single-site build output never leaks into the hub
- Purge stale collected artifacts (404.html, assets/, search/, sitemaps,
  objects.inv, duplicate mcp/) from every repo dir, matching the cleaned
  source site/ roots
- Refresh collected output from source repos, incl. the khata-app app
- Remove the vendored Blog API docs (config.yml entry + blog/) and its card

hexa/mcp/modules/hexa.cli.json

@@ -1,79 +0,0 @@
-{
-  "module": "hexa.cli",
-  "content": {
-    "path": "hexa.cli",
-    "docstring": "Command-line interface for hexa utilities.",
-    "objects": {
-      "argparse": {
-        "name": "argparse",
-        "kind": "alias",
-        "path": "hexa.cli.argparse",
-        "signature": "<bound method Alias.signature of Alias('argparse', 'argparse')>",
-        "docstring": null
-      },
-      "sys": {
-        "name": "sys",
-        "kind": "alias",
-        "path": "hexa.cli.sys",
-        "signature": "<bound method Alias.signature of Alias('sys', 'sys')>",
-        "docstring": null
-      },
-      "Path": {
-        "name": "Path",
-        "kind": "alias",
-        "path": "hexa.cli.Path",
-        "signature": "<bound method Alias.signature of Alias('Path', 'pathlib.Path')>",
-        "docstring": null
-      },
-      "pprint": {
-        "name": "pprint",
-        "kind": "alias",
-        "path": "hexa.cli.pprint",
-        "signature": "<bound method Alias.signature of Alias('pprint', 'pprint.pprint')>",
-        "docstring": null
-      },
-      "check_matches": {
-        "name": "check_matches",
-        "kind": "function",
-        "path": "hexa.cli.check_matches",
-        "signature": "<bound method Alias.signature of Alias('check_matches', 'hexa.check_matches.check_matches')>",
-        "docstring": "Verify two representations agree.\n\nParameters\n----------\npath_a : str | Path\n    Path to a .yaml or .py file.\npath_b : str | Path\n    Path to a .yaml or .py file.\n\nReturns\n-------\nbool | list[str]\n    True if they match exactly, otherwise a list of difference strings."
-      },
-      "generate_abc": {
-        "name": "generate_abc",
-        "kind": "function",
-        "path": "hexa.cli.generate_abc",
-        "signature": "<bound method Alias.signature of Alias('generate_abc', 'hexa.generate_abc.generate_abc')>",
-        "docstring": "Generate ABC Python source from a :class:`PortNode` tree.\n\nParameters\n----------\nnode : PortNode\n    The root of the parsed YAML (or generated) tree.\nout_path : str | Path | None\n    Optional file path to write the generated source to.\n\nReturns\n-------\nstr\n    The generated Python source code."
-      },
-      "generate_yaml": {
-        "name": "generate_yaml",
-        "kind": "function",
-        "path": "hexa.cli.generate_yaml",
-        "signature": "<bound method Alias.signature of Alias('generate_yaml', 'hexa.generate_yaml.generate_yaml')>",
-        "docstring": "Generate YAML source from a :class:`PortNode` tree.\n\nParameters\n----------\nnode : PortNode\n    The root of the tree.\nout_path : str | Path | None\n    Optional file path to write the generated source to.\n\nReturns\n-------\nstr\n    The generated YAML source."
-      },
-      "parse_abc": {
-        "name": "parse_abc",
-        "kind": "function",
-        "path": "hexa.cli.parse_abc",
-        "signature": "<bound method Alias.signature of Alias('parse_abc', 'hexa.parse_abc.parse_abc')>",
-        "docstring": "Parse an ABC Python module into a :class:`PortNode` tree.\n\nABC classes become port nodes.  A nested-struct attribute is expressed as a\n``@dataclass`` annotation on an ABC port (e.g. ``source: ExtractionSource``\nwhere ``ExtractionSource`` is a ``@dataclass``); the dataclass's fields are\nexpanded into a nested ``attributes`` entry.\n\nParameters\n----------\nmodule_or_path : str | Path | Any\n    A file path to a ``.py`` file, a module import string, or a loaded module.\n\nReturns\n-------\nPortNode\n    The root node of the tree."
-      },
-      "parse_yaml": {
-        "name": "parse_yaml",
-        "kind": "function",
-        "path": "hexa.cli.parse_yaml",
-        "signature": "<bound method Alias.signature of Alias('parse_yaml', 'hexa.parse_yaml.parse_yaml')>",
-        "docstring": "Parse a hexa YAML spec file into a :class:`PortNode` tree.\n\nParameters\n----------\npath : str | Path\n    Path to the ``.yaml`` file.\n\nReturns\n-------\nPortNode\n    The root node of the parsed tree.\n\nRaises\n------\nValueError\n    On structural errors in the YAML."
-      },
-      "main": {
-        "name": "main",
-        "kind": "function",
-        "path": "hexa.cli.main",
-        "signature": "<bound method Function.signature of Function('main', 15, 87)>",
-        "docstring": null
-      }
-    }
-  }
-}