T10: what GoToSocial had not yet been asked, and quick edits that were lost

The GoToSocial scenario gains 17 checks:
- alice's reply threads under gtsuser's post;
- gtsuser's edit arrives with edited_at and two history entries;
- unlike and unboost both ways;
- images with alt text both ways, theirs through our proxy;
- gtsuser follows a PrivaPub community and its announce brings the post;
- gtsuser's request to join a circle waits for the owner and is approved, and the
  circle post is never served unsigned;
- a locked persona holds gtsuser's follow, rejects it, then authorizes it;
- the deploy's Mastodon smoke check passes, signed in.

54 checks passed, three runs in a row. The circle post reaching gtsuser is an expected
failure: GoToSocial keeps no post addressed only to a collection it does not know.

It found a bug. An edit made within the second the post was published carries GoToSocial's
whole-second updated == published, and IsEdit wanted strictly newer, so the edit was taken
as a refresh and lost. A first edit now also counts when it is no older and the text,
warning or title actually changed. A bare refresh still never makes a revision.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ELjqpznMFMNrJoJUj6K5p2

tools/pasture/lib/interop.sh

@@ -14,6 +14,14 @@ site() { curl -k --resolve "$1:6443:127.0.0.1" "${@:2}"; }
 # fetches one of PrivaPub's own https URIs (ids, scribbles) from the workstation, through Caddy
 pfetch() { curl -sk --connect-to privapub.test:443:127.0.0.1:6443 "$@"; }
 
+# make_png <path>: an 8x8 red PNG, for uploads
+make_png() { python3 -c "
+import struct,zlib
+w=h=8
+raw=b''.join(b'\x00'+bytes([200,60,60])*w for _ in range(h))
+png=b'\x89PNG\r\n\x1a\n'+b''.join(struct.pack('>I',len(c))+t+c+struct.pack('>I',zlib.crc32(t+c)&0xffffffff) for t,c in [(b'IHDR',struct.pack('>IIBBBBB',w,h,8,2,0,0,0)),(b'IDAT',zlib.compress(raw)),(b'IEND',b'')])
+open('$1','wb').write(png)"; }
+
 ROOT_USER=pastureroot; ROOT_PASS='Pasture-Pass-1!'
 privapub_root() {
 	local root