fix(herdr): resolve shim routing defects, add workspace scoping, and bump to v3.0.1

- Resolve Herdr shim 5 routing & paste defects (ISSUE-1 ~ ISSUE-5):
  * paste-buffer: use pane send-text without auto-enter, propagate rc=3 to send_keys_safe
  * exact-match pane resolution: remove substring matching ('in tn') across all branches
  * workspace scoping: introduce HERDR_WORKSPACE_ID and .mam/herdr_workspace_id persistence
  * unified resolver: single _resolve_herdr_pane_id helper across shim commands
- Resolve dialog token false-positive on 'Yes, try it' tip and isolate fullscreen modal rejection
- Sync mock Herdr CLI contracts in tests/conftest.py
- Add contract tests H-15~H-23 and regression tests D-4~D-7 (412 tests, 100% PASS)
- Add multi-agent loop plans, review reports, and bug report
- Update framework and skill packages to v3.0.1

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

@@ -1,7 +1,7 @@
 ---
 name: multi-agent-mux-stop
 description: "Stop an agent herdr session (claude, antigravity/agy) and update .mam/agent-sessions.yaml. Default stops gracefully and marks status=stopped with conversation preserved for resume. Does NOT delete on-disk conversation artifacts (jsonl/db) — those are preserved unless --purge-conversation is passed. Use when ending a work session, switching to a different one, or cleaning up before a fresh start."
-version: 3.0.0
+version: 3.0.1
 author: godopu
 license: MIT
 platforms: [linux, macos]