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

.agents/skills/multi-agent-mux-create/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: multi-agent-mux-create
 description: "Create a new agent session (claude, antigravity/agy) in a dedicated herdr session for context-preserving long-running work. Always creates a herdr session — never backgrounds with nohup/disown. Writes the new session to .mam/agent-sessions.yaml. Use when you want to start a fresh agent (no prior UUID) for a new project workspace."
-version: 4.4.2
+version: 4.4.3
 author: godopu
 license: MIT
 platforms: [linux, macos]