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

mail-intake/mcp/modules/mail_intake.models.message.json

@@ -1,95 +0,0 @@
-{
-  "module": "mail_intake.models.message",
-  "content": {
-    "path": "mail_intake.models.message",
-    "docstring": "# Summary\n\nMessage domain models for Mail Intake.\n\nThis module defines the **canonical, provider-agnostic representation**\nof an individual email message as used internally by the Mail Intake\ningestion pipeline.\n\nModels in this module are safe to persist and must not contain any\nprovider-specific fields or semantics.",
-    "objects": {
-      "dataclass": {
-        "name": "dataclass",
-        "kind": "alias",
-        "path": "mail_intake.models.message.dataclass",
-        "signature": "<bound method Alias.signature of Alias('dataclass', 'dataclasses.dataclass')>",
-        "docstring": null
-      },
-      "datetime": {
-        "name": "datetime",
-        "kind": "alias",
-        "path": "mail_intake.models.message.datetime",
-        "signature": "<bound method Alias.signature of Alias('datetime', 'datetime.datetime')>",
-        "docstring": null
-      },
-      "MailIntakeMessage": {
-        "name": "MailIntakeMessage",
-        "kind": "class",
-        "path": "mail_intake.models.message.MailIntakeMessage",
-        "signature": "<bound method Class.signature of Class('MailIntakeMessage', 18, 79)>",
-        "docstring": "Canonical internal representation of a single email message.\n\nNotes:\n    **Guarantees:**\n\n        - This model represents a fully parsed and normalized email message.\n        - It is intentionally provider-agnostic and suitable for\n          persistence, indexing, and downstream processing.\n\n    **Constraints:**\n\n        - No provider-specific identifiers, payloads, or API semantics\n          should appear in this model.",
-        "members": {
-          "message_id": {
-            "name": "message_id",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.message_id",
-            "signature": null,
-            "docstring": "Provider-specific message identifier."
-          },
-          "thread_id": {
-            "name": "thread_id",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.thread_id",
-            "signature": null,
-            "docstring": "Provider-specific thread identifier to which this message belongs."
-          },
-          "timestamp": {
-            "name": "timestamp",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.timestamp",
-            "signature": null,
-            "docstring": "Message timestamp as a timezone-naive UTC datetime."
-          },
-          "from_email": {
-            "name": "from_email",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.from_email",
-            "signature": null,
-            "docstring": "Sender email address."
-          },
-          "from_name": {
-            "name": "from_name",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.from_name",
-            "signature": null,
-            "docstring": "Optional human-readable sender name."
-          },
-          "subject": {
-            "name": "subject",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.subject",
-            "signature": null,
-            "docstring": "Raw subject line of the message."
-          },
-          "body_text": {
-            "name": "body_text",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.body_text",
-            "signature": null,
-            "docstring": "Extracted plain-text body content of the message."
-          },
-          "snippet": {
-            "name": "snippet",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.snippet",
-            "signature": null,
-            "docstring": "Short provider-supplied preview snippet of the message."
-          },
-          "raw_headers": {
-            "name": "raw_headers",
-            "kind": "attribute",
-            "path": "mail_intake.models.message.MailIntakeMessage.raw_headers",
-            "signature": null,
-            "docstring": "Normalized mapping of message headers (header name → value)."
-          }
-        }
-      }
-    }
-  }
-}