feat(mcp): add simplified ingest uploads

Add a one-shot IngestManager upload path, an ingest_file_base64 MCP tool, and an authenticated /mcp-ingest/uploads multipart HTTP endpoint so remote agents can transfer files without manual chunk orchestration.

Keep uploaded files in runtime staging outside the vault and let wiki-ingest/OpenCode decide archival, registry updates, and index rebuilds.

Update service output, docs, and agent rules to make the preferred upload path discoverable while preserving chunked tools as a fallback.

Validation: python3 -m unittest discover -v; python3 -m py_compile obsidian_wiki/mcp_ingest.py obsidian_wiki/mcp_server.py scripts/manage_mcp_service.py tests/test_mcp_ingest.py tests/test_mcp_server_remote.py tests/test_mcp_service.py; git diff --check

scripts/manage_mcp_service.py

@@ -28,6 +28,7 @@ MCP_CLIENT_NAME = "wiki-file-assets"
 DEFAULT_HOST = "0.0.0.0"
 DEFAULT_PORT = 8765
 DEFAULT_PATH = "/mcp"
+DEFAULT_INGEST_UPLOAD_PATH = "/mcp-ingest/uploads"
 DEFAULT_TOKEN_BYTES = 32
 DEFAULT_UV_CACHE_DIR = "/tmp/uv-cache"
 DEFAULT_OPENCODE_PATH = "opencode"
@@ -340,6 +341,22 @@ def render_remote_config(
     enabled_section = ""
     if enabled_tools is not None:
         enabled_section = f"\nEnabled tool groups:\n{format_enabled_tools(enabled_tools) or 'none'}\n"
+    ingest_upload_section = ""
+    if enabled_tools is not None and TOOL_INGEST in normalize_enabled_tools(enabled_tools):
+        upload_url = f"http://{host}:{port}{DEFAULT_INGEST_UPLOAD_PATH}"
+        upload_alternatives = "\n".join(
+            f"- http://{candidate}:{port}{DEFAULT_INGEST_UPLOAD_PATH}" for candidate in hosts[1:]
+        )
+        upload_alternatives_section = (
+            f"\nOther ingest upload addresses:\n{upload_alternatives}\n" if upload_alternatives else ""
+        )
+        ingest_upload_section = (
+            "\n"
+            "Ingest file upload endpoint:\n"
+            f"{upload_url}\n"
+            f"{upload_alternatives_section}"
+            "Use the same Authorization header. POST multipart/form-data with one or more `files` fields.\n"
+        )
     return (
         "MCP service is running.\n"
         "\n"
@@ -348,6 +365,7 @@ def render_remote_config(
         f"{alternatives_section}"
         f"{config_section}"
         f"{enabled_section}"
+        f"{ingest_upload_section}"
         "\n"
         "Use this header:\n"
         f"Authorization: Bearer {token}\n"