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-monitor/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: multi-agent-mux-monitor
 description: "Run a long-lived reconciler that watches .mam/agent-sessions.yaml against the actual herdr/agent runtime state and reconciles them. Use when you want live visibility into which agent sessions are running, which are dead, which have stale YAML entries, and which have new session ids that haven't been recorded yet. Runs as a persistent loop (`reconcile.sh --subscribe`) that keeps going until it times out, idles out, or is interrupted."
-version: 4.4.2
+version: 4.4.3
 author: godopu
 license: MIT
 platforms: [linux, macos]