refactor: 技能統一收進 jsc-skills，加入 herdr，版本統一為 0.0.1

- 新增 jsc-skills plugin，含 herdr、herdr-issue、ingest，以 /jsc-skills:<名稱> 呼叫
- ingest 自 companion 移入，移除獨立的 herdr-issue plugin
- companion 版本由 0.0.3 改為 0.0.1

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

plugins/jsc-skills/skills/herdr-issue/scripts/pr-wait.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# 用法：pr-wait.sh <owner/repo> <N>
+# 阻塞到 head 為 issue-N 的 PR 有衝突、被關閉或合併，或議題被關閉。
+# 最後一行印出原因：conflict | closed | merged | issue-closed
+source "$(dirname "$0")/lib.sh"
+REPO="${1:?}"; N="${2:?用法：pr-wait.sh <owner/repo> <N>}"
+while :; do
+  read -r PR STATE MERGEABLE <<<"$(pr_for_issue "$REPO" "$N")" || true
+  if [ -z "${PR:-}" ]; then
+    echo "還沒有 head 為 issue-$N 的 PR，$INTERVAL 秒後再查"
+  else
+    case "$STATE" in
+      merged) echo "PR #$PR 已合併"; echo merged; exit 0 ;;
+      closed) echo "PR #$PR 被關閉（未合併）"; echo closed; exit 0 ;;
+      open)
+        if [ "$MERGEABLE" = "false" ]; then
+          sleep 60
+          read -r _ _ AGAIN <<<"$(pr_for_issue "$REPO" "$N")"
+          if [ "$AGAIN" = "false" ]; then echo "PR #$PR 與 main 有衝突"; echo conflict; exit 0; fi
+        fi ;;
+    esac
+  fi
+  if [ "$(issue_state "$REPO" "$N")" = "closed" ]; then echo "議題 #$N 已關閉"; echo issue-closed; exit 0; fi
+  sleep "$INTERVAL"
+done