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/unittests/xmpp/stub_xmpp.c

@@ -1,11 +1,3 @@
-/*
- * stub_xmpp.c
- *
- * Copyright (C) 2015 - 2018 James Booth <boothj5@gmail.com>
- * Copyright (C) 2019 - 2026 Michael Vetter <jubalh@iodoru.org>
- *
- * SPDX-License-Identifier: GPL-3.0-or-later
- */
 #include "prof_cmocka.h"
 
 #include "xmpp/xmpp.h"
@@ -170,6 +162,11 @@ connection_get_profanity_identifier(void)
     return "profident";
 }
 
+void
+connection_debug_print_features()
+{
+}
+
 jabber_conn_status_t
 connection_register(const char* const altdomain, int port, const char* const tls_policy,
                     const char* const username, const char* const password)
@@ -616,9 +613,3 @@ void
 blocked_ac_reset(void)
 {
 }
-
-GList*
-connection_get_available_resources(void)
-{
-    return NULL;
-}