_mesh_graph_capturing() replaces the three copies of `hasattr(self.bot, "mesh_graph") and self.bot.mesh_graph and self.bot.mesh_graph.capture_enabled`, evaluated in the same order after the same preceding conditions.
_manage_contact_capacity(contact_name, after_add) replaces the two copies of the near-limit check in handle_new_contact (device mode, and bot mode after an add attempt). The WARNING and INFO lines keep their exact text, including the " after add" and " after add attempt" suffixes in bot mode; new tests pin all four lines and the cleanup call, and pass against the code before this commit.
handle_new_contact, _process_advertisement_packet, _ensure_contact_meshcore_path_encoding and the NEW_CONTACT helpers from #335 (_remember_advert_rf, _find_advert_rf_data, _claim_new_contact_add, _release_new_contact_add) move verbatim (AST-identical) to modules/contact_events.py. MessageHandler mixes it in, so names, callers (core's NEW_CONTACT subscription, the prefix collision service) and tests are unchanged. message_handler keeps importing upsert_zero_hop_observed_path_via_manager and encode_path_len_byte as re-exports.
The one test that patched modules.message_handler.upsert_zero_hop_observed_path_via_manager now patches it in modules.contact_events, where the moved code looks it up.
agessaman