release(v4.4.3): bump framework and eight skills to 4.4.3 in lockstep

PATCH release for the fix/issue-10-11-13-15 branch (Issue #10 agy purge
sidecars, #11 orc_onboard message, #13 orchestrator conversation purge,
#15 workspace-anchored job registry). No code logic changes.

- lib.sh MAM_VERSION, lib_py/loop/eager.py FRAMEWORK_VERSION and the eight
  SKILL.md frontmatters (create, stop, resume, status, monitor, delegate-job,
  loop, orc-onboard) move from 4.4.2 to 4.4.3
- VERSIONS.md: current release v4.4.3 (2026-09-13 KST), the eight-row skill
  matrix, and a v4.4.3 changelog section in the v4.4.2 format covering the
  agy purge sidecars/annotation/presence lock and residual_artifacts,
  `lib_py.agents purge` and `orc_onboard.sh --remove --purge-conversation`
  with their exit codes, the past-tense message, the MAM_JOBS_DIR ->
  WORKSPACE_ROOT -> cwd registry/log resolution and the 20 new tests
- README, README.ko, BOOTSTRAP and BOOTSTRAP.ko badges and the MESSAGING.md
  "Applies to" header follow the current version; historical 4.4.2 mentions
  (v4.4.2 changelog, reviewer reports) stay as history

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGpJXhSZasJLU38ksDghe

README.ko.md

@@ -2,7 +2,7 @@
 
 Herdr와 MQTT 브로커를 기반으로 구축된 고신뢰성 **다중 에이전트 오케스트레이션 및 메시징 백플레인** 프레임워크입니다. `claude`, `agy`, `hermes`, `grok`, `opencode`, `codex` 등 다중 LLM 백엔드 에이전트 전반에 걸쳐 장시간 수행되는 작업(코드 생성, 리팩토링, 보안 검토 등)을 조정, 격리 및 감사할 수 있도록 설계되었습니다.
 
-[![Version: v4.4.2](https://img.shields.io/badge/version-v4.4.2-blue.svg)](VERSIONS.md)
+[![Version: v4.4.3](https://img.shields.io/badge/version-v4.4.3-blue.svg)](VERSIONS.md)
 
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