- Add prime_for_presence_to() and prime_get_for_presence_to() in prime.c
- Add presence_to_callback() in server.c to handle MUC join presence
- Export stbbr_for_presence_to() in stabber.h
- Add stanzas_debug_last() for debugging failed verifications
- Reset depth counter in parser_init() to fix stanza parsing between connections
- Properly track depth for virtual wrapper element
- Add debug logging in stanzas_verify_any() to trace stanza matching
- Add special handling for <stream:stream> (unclosed root element)
- Feed virtual <wrapper> element to allow multiple root stanzas
- Support non-<query/> IQ payloads like <ping/> (XEP-0199)
- Relax stanza matching: allow extra attrs/children in received
- Add legacy auth feature in stream:features
- Use larger read buffer (1024 bytes) for efficiency
- Clear curr_string buffer after each stanza
