Add memnex schema (#5676)

* Add memnex schema

memnex is an open specification for portable meeting outputs
(transcripts, summaries, action items, decisions) from local-first
processing tools.

Spec: https://github.com/UladzKha/memnex
Reference implementation: https://www.npmjs.com/package/memnex-spec

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: UladzKha

src/api/json/catalog.json

@@ -9823,6 +9823,12 @@
       "description": "Configuration file for Acton projects",
       "fileMatch": ["Acton.toml"],
       "url": "https://raw.githubusercontent.com/ton-blockchain/acton/master/crates/acton-config/schemas/acton.schema.json"
+    },
+    {
+      "name": "memnex",
+      "description": "Open specification for portable meeting outputs — transcripts, summaries, action items, and decisions. https://github.com/UladzKha/memnex",
+      "fileMatch": ["*.memnex.json", "meeting-output.json"],
+      "url": "https://raw.githubusercontent.com/UladzKha/memnex/main/schema/v0.1/meeting-output.schema.json"
     }
   ]
 }