put $type in array path

nothing is escaped, unclear how universal the $type convention is, etc.

link_aggregator/readme.md

···
   - [x] jetstream: don't rotate servers, explicitly pass via cli
 - [x] metrics!
   - [x] event ts lag
-- [~] machine resource metrics
+- [x] machine resource metrics
   - [x] disk consumption
   - [x] cpu usage
   - [x] mem usage
   - [x] network?
-- [ ] make all storage apis return Result
+- [ ] make all rocks apis return Result instead of unwrapping
 - [ ] handle all the unwraps
 - [ ] deadletter queue of some kind for failed db writes
   - [ ] also for valid json that was rejected?
···
 - [x] don't remove deleted links from the reverse records -- null them out. this will keep things stable for paging.
 - [x] don't show deactivated accounts in link responses
 - [ ] links:
-  - [ ] pull `$type`/`type` from object children of arrays (distinguish replies, quotes, etc)
-  - [ ] actually define the format (deal with in-band dots etc)
-  - [ ] _could_ throw cid neighbour into the target. probably should? but it's a lot of high volume uncompressible bytes
+  - [~] pull `$type`/`type` from object children of arrays (distinguish replies, quotes, etc)
+    - just $type to start
+  - [ ] rewrite the entire "path" stuff
+    - [ ] actually define the format (deal with in-band dots etc)
+    - [x] ~_could_ throw cid neighbour into the target. probably should? but it's a lot of high volume uncompressible bytes~
       - and it could be looked up from the linker's doc
+      - ^^ for now, look up from source doc to get cid. might revisit this later.

links/src/record.rs

···
             }
         }
         JsonValue::Array(a) => {
-            let p = format!("{path}[]");
             for child in a {
-                walk_record(&p, child, found)
+                let child_p = match child {
+                    JsonValue::Object(o) => {
+                        if let Some(JsonValue::String(t)) = o.get("$type") {
+                            format!("{path}[{t}]")
+                        } else {
+                            format!("{path}[]")
+                        }
+                    }
+                    _ => format!("{path}[]"),
+                };
+                walk_record(&child_p, child, found)
             }
         }
         JsonValue::String(s) => {
···
                     Link::Uri("https://youtu.be/oKXm4szEP1Q?si=_0n_uPu4qNKokMnq".into()),
                 ),
                 l(
-                    ".facets[].features[].uri",
+                    ".facets[].features[app.bsky.richtext.facet#link].uri",
                     Link::Uri("https://youtu.be/oKXm4szEP1Q?si=_0n_uPu4qNKokMnq".into()),
                 ),
             ]