chore: drop tool-name markers from source comments

Seventeen comments opened with a tag naming the tool that wrote them.
The tag goes and each comment keeps its reasoning, now starting as a
plain sentence. None of the reasoning changes.

The AGENTS.md note in .gitignore drops the story of how the file got
into the tree and keeps the one fact a reader needs: its advice to run
go fmt is destructive on this CRLF working tree.

Comments only; no code, build or test changes.

internal/api/handlers_access.go

@@ -416,7 +416,7 @@ type lpPermissionView struct {
 // maxLPInfoPages bounds how many "permission info" pages the read projector
 // chases per request. LuckPerms paginates its reply, so one command shows only
 // the first page; we follow the header's page count up to this cap.
-// ponytail: 10 pages ≈ 150 entries — raise if a real user outgrows it.
+// 10 pages ≈ 150 entries — raise if a real user outgrows it.
 const maxLPInfoPages = 10
 
 // handleAccessLuckPermsInfo is the read projector for a player's LuckPerms