refactor(releaser): 将 manage-release 改名为 releaser

- skills/manage-release -> skills/releaser（git mv，内容不变）
- releaser 的 frontmatter/标题改名，description 保留旧名作为触发词
- skills/manage-release/ 保留为纯弃用占位（SKILL.md + README.md，指向 releaser），
  已装软链与旧项目 .pouch.yaml 不再悬空或失效
- 同步或引用：AGENTS.md、README.md、docs/getting-started.md、orc（routing/SKILL/README）、
  ack delivery、builder（SKILL/README/contract）、memory-distill、pouch onboard 与
  suggest_skills
- 测试：catalog 需列出旧名占位，新增弃用占位断言，orc children 纳入旧名占位

skills/pouch/references/onboard.md

@@ -42,7 +42,7 @@ pouch add <name> -a cursor -a claude -a codex -a agents -y
 一次问清要初始化哪些。用户没点名不要自己跑初始化。ACK 初始化**不会**自动初始化
 deployer / builder，需要的话要另说。
 
-orc、manage-release 和其余 builtin 装上就能用，不必项目初始化。
+orc、releaser 和其余 builtin 装上就能用，不必项目初始化。
 
 ## 4. 介绍怎么喊
 

skills/pouch/scripts/suggest_skills.py

@@ -32,7 +32,7 @@ FILE_SIGNALS: dict[str, tuple[str, ...]] = {
         "k8s",
         "helm",
     ),
-    "manage-release": ("CHANGELOG.md", "CHANGELOG", "VERSION"),
+    "releaser": ("CHANGELOG.md", "CHANGELOG", "VERSION"),
     "declarative-openspec-loop": ("openspec", ".openspec"),
     "discussion-notes": ("000inbox",),
 }