feat(lexicon): comment record and custom richtext facets

packages/lexicons/defs/app.bsky.richtext.facet.json packages/lexicons/defs/sh/comet/v0/richtext/facet.json

···
 {
   "lexicon": 1,
-  "id": "app.bsky.richtext.facet",
+  "id": "sh.comet.v0.richtext.facet",
   "defs": {
     "main": {
       "type": "object",
···
       "required": ["tag"],
       "properties": {
         "tag": { "type": "string", "maxLength": 640, "maxGraphemes": 64 }
+      }
+    },
+    "timestamp": {
+      "type": "object",
+      "description": "Facet feature for a timestamp in a track. The text usually is in the format of 'hh:mm:ss' with the hour section being omitted if unnecessary.",
+      "properties": {
+        "timestamp": {
+          "type": "integer",
+          "minimum": 0,
+          "description": "Reference time, in seconds."
+        }
       }
     },
     "byteSlice": {

packages/lexicons/defs/sh/comet/v0/actor/profile.json

···
           "descriptionFacets": {
             "type": "ref",
             "description": "Annotations of the user's description.",
-            "ref": "app.bsky.richtext.facets"
+            "ref": "sh.comet.v0.richtext.facet"
           },
           "avatar": {
             "type": "blob",
···
           },
           "featured": {
             "type": "array",
-            "items": {
-              "type": "ref",
-              "ref": "com.atproto.repo.strongRef"
-            }
+            "description": "Pinned items to be shown first on the user's profile.",
+            "maxLength": 5,
+            "items": { "type": "string", "format": "at-uri" }
           },
           "createdAt": { "type": "string", "format": "datetime" }
         }

packages/lexicons/defs/sh/comet/v0/feed/comment.json

···
+{
+  "lexicon": 1,
+  "id": "sh.comet.v0.feed.comment",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A comment on a piece of Comet media.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["text", "subject", "createdAt"],
+        "properties": {
+          "text": {
+            "type": "string",
+            "minLength": 1,
+            "minGraphemes": 1,
+            "maxLength": 3000,
+            "maxGraphemes": 300,
+            "description": "The comment's content."
+          },
+          "subject": {
+            "type": "string",
+            "format": "at-uri",
+            "description": "The piece of media being commented on."
+          },
+          "reply": {
+            "type": "string",
+            "format": "at-uri",
+            "description": "Another sh.comet.v0.feed.comment this is in reply to."
+          },
+          "langs": {
+            "type": "array",
+            "description": "Indicates human language of the comment's text content.",
+            "maxLength": 3,
+            "items": { "type": "string", "format": "language" }
+          },
+          "facets": {
+            "type": "array",
+            "description": "Annotations of text (mentions, URLs, hashtags, etc)",
+            "items": { "type": "ref", "ref": "sh.comet.v0.richtext.facet" }
+          },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}

packages/lexicons/defs/sh/comet/v0/feed/playlist.json

···
             "maxLength": 20000,
             "maxGraphemes": 2000
           },
+          "descriptionFacets": {
+            "type": "ref",
+            "description": "Annotations of the playlist's description.",
+            "ref": "sh.comet.v0.richtext.facets"
+          },
           "type": {
             "type": "string",
             "description": "Type of the playlist. Allows differentiating between playlist's different purposes.",

packages/lexicons/defs/sh/comet/v0/feed/track.json

···
           "descriptionFacets": {
             "type": "ref",
             "description": "Annotations of the track's description.",
-            "ref": "app.bsky.richtext.facets"
+            "ref": "sh.comet.v0.richtext.facets"
           },
           "tags": {
             "type": "array",