hive-c0re: drop redundant METHOD/path prefixes from OpenAPI summaries

Swagger UI's endpoint-list row already shows the HTTP method badge +
path for every row, so restating `METHOD /path` at the start of a
handler's own summary is pure duplication. Strips that self-referential
prefix from every summary that has it and re-capitalizes what follows
as a standalone sentence.

Left two false positives untouched: misc_api.rs's operator-inbox
summary cross-references a *different* sibling endpoint
(mark-all-read) for context, and topology.rs's SetParentForm struct
doc happens to mention its endpoint's path but isn't a handler summary
line. Both are legitimate, not redundant.

hive-c0re/src/dashboard/matrix_accounts.rs

@@ -103,7 +103,7 @@ fn account_name_from_filename(fname: &str) -> Option<String> {
     Some(suffix.to_owned())
 }
 
-/// `GET /api/matrix-accounts?agent=<name>` — matrix accounts provisioned
+/// Matrix accounts provisioned
 /// for `agent`.
 ///
 /// Backfilled with `homeserver`/`live`/`user_id` from the daemon's
@@ -343,7 +343,7 @@ struct GithubAccountStatus {
     present: bool,
 }
 
-/// `GET /api/github-account?agent=<name>` — whether the agent has a GitHub
+/// Whether the agent has a GitHub
 /// PAT provisioned (its `github-token` file exists).
 ///
 /// Lets the credentials tab show "token stored" vs "not set" instead of a