revert: restore pre-upstream-merge baseline (tree of 3b673150b)

Roll the tree back to the pre-merge tip 3b673150b, undoing the upstream sync merge 72f4f186d (303 files) and the 13 post-merge commits layered on top of it.

Purpose: restore the last pre-sync baseline so the reported OMEMO/OTR encryption regressions can be reproduced against a known-good state and the upstream sync ruled in or out as the cause. Nothing is dropped from history; the merge and every post-merge commit remain reachable and can be cherry-picked back selectively.

Baseline:     3b673150b chore(chatlog): disable background message file logging (stage 1)

Undoes merge: 72f4f186d merge: sync upstream profanity-im/profanity

tests/functionaltests/test_receipts.c

@@ -33,7 +33,7 @@ send_receipt_request(void **state)
     // Register disco#info response for capabilities query (receipts support)
     stbbr_for_query("http://jabber.org/protocol/disco#info",
         "<iq from='buddy1@localhost/laptop' to='stabber@localhost' id='*' type='result'>"
-            "<query xmlns='http://jabber.org/protocol/disco#info' node='http://profanity-im.github.io#JNkIRQChhYM8+Co3IypmMtMJnOE='>"
+            "<query xmlns='http://jabber.org/protocol/disco#info' node='http://profanity-im.github.io#hAkb1xZdJV9BQpgGNw8zG5Xsals='>"
                 "<identity category='client' name='Profanity 0.5.0' type='console'/>"
                 "<feature var='urn:xmpp:receipts'/>"
             "</query>"
@@ -44,7 +44,7 @@ send_receipt_request(void **state)
         "<presence to='stabber@localhost' from='buddy1@localhost/laptop'>"
             "<priority>15</priority>"
             "<status>My status</status>"
-            "<c hash='sha-1' xmlns='http://jabber.org/protocol/caps' node='http://profanity-im.github.io' ver='JNkIRQChhYM8+Co3IypmMtMJnOE='/>"
+            "<c hash='sha-1' xmlns='http://jabber.org/protocol/caps' node='http://profanity-im.github.io' ver='hAkb1xZdJV9BQpgGNw8zG5Xsals='/>"
         "</presence>"
     );