[HANCORE-linux]

Summary

• Send saved profile nicknames to existing native Tox groups. Include sparse and still-joining groups in the bounded inventory instead of treating the initialized-group count as its endpoint.
• Publish Friends snapshots after Tox iteration, when native friend-name getters contain the new value, so open DirectChats do not need a panel refresh.
• Report incomplete group updates with a request-correlated warning rather than a success acknowledgement. Preserve the saved profile, support explicit same-name retries, and retain fail-closed identity handling for uncertain saves.
• Add native C and helper-IPC fault regressions, two-helper live-name checks, and Panel/Service correlation coverage. No QML-only name substitution or automatic retry queue.

Validation

• make test and local make test-ci passed; the latter excludes native Quickshell/Omarchy fixtures.
• sh tests/phase3.sh passed, including unsolicited Direct and Group name updates in both directions, repeated/Unicode changes, and existing groups. No post-rename status/list request or chat message triggers the refresh.
• Helper build/hardening, architecture and plugin validation, no-Signal build guard, PlainText policy, ShellCheck, Python syntax, and whitespace checks passed.
• qmllint passed for ChatSurface.qml, pages/ChatPage.qml, and Service.qml.
• Independent cumulative read-only review found no remaining actionable findings. The joining-group inventory finding was fixed and covered by a reproducing regression.

Limits and earlier failures

• Native Wayland/two-machine repeat acceptance remains pending; this PR does not deploy the change. Native send acceptance is not acknowledgement from every peer.
• qmllint Panel.qml still exits 255 without diagnostics; the Panel/Service runtime fixture passed.
• One earlier phase3 run failed at the existing kick check. A subsequent complete run passed; the earlier cause is not established. Failure diagnostics now report aggregate errors and group changes only.
• An earlier make test run hit ProcessLookupError while reading /proc in the unchanged emoji process-cleanup test. The full repeat and headless suite passed; that separate test was not modified.