feat(gitea): 新增 wiki 轉議題技能

What：新增 wiki-to-issue 技能，把一頁 wiki 轉成同一個存取庫的議題；配套新增 tools/gitea-link.sh 解析連結、tools/issue.sh 讀寫議題。

Why：wiki 頁要變成可追蹤的工作時，原本得自己拼 API：組 JSON、查標籤 id、挑回應欄位，跳脫一錯就把對外的議題內容寫壞。

How：連結是唯一入口，gitea-link.sh 解不出 wiki 頁就中止，不猜存取庫也不猜頁名；標籤只從既有的挑；站台沒有專案看板 API 時據實回報請使用者手動拖，不假裝關聯成功。

Who：使用 jsc 技能組、需要把 wiki 內容交辦出去的人。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

skills/wiki-to-issue/SKILL.md

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+---
+name: wiki-to-issue
+description: Turn one Gitea wiki page into an issue in the same repository. Parse the link with tools/gitea-link.sh, read the page through jsc-gitea:wiki, draft title and body as a sub agent, then create the issue with tools/issue.sh - labels picked from the repository's existing set per the jsc-ask decision tree, project board attached or reported as manual when the site has no board API. A request without a wiki link stops the skill immediately: never guess the repository or the page. Use when a wiki page has to become trackable work; not for issues drafted from scratch, and not for syncing an issue that already exists.
+---
+
+# wiki-to-issue — a wiki page becomes an issue
+
+The wiki link is the only input. Everything else — repository, page name, host — comes out of that link.
+
+## Steps
+
+1. **Link gate.** Run `tools/gitea-link.sh parse {url}` on the link the user gave. Exit 3, no link in the request, or `kind=issue` (this skill reads wiki pages, not issues) all mean the same thing: **stop and report which one it was**. Never ask for a repository name instead, and never fall back to the working directory's remote — a page written into the wrong repository's issue tracker is public and hard to take back. Completion condition: `kind=wiki`, and `repo`, `page` and `host` are known.
+2. Read the page with `jsc-gitea:wiki` (`wiki-get {repo} {page}`). Exit 4 means the page does not exist — stop and report the page name. Take the page's absolute URL from `wiki-url` in the same pass; it goes into the issue body. Completion condition: the page's markdown and its absolute URL are both in hand.
+3. **Draft the issue — this step MUST run as a sub agent.** Title: the page's first heading, or the page name when it has none. Body: the page content in Traditional Chinese, opening with a 「來源：{絕對網址}」 line so the issue points back at the wiki. Convert `[[display|page]]` links to absolute URLs (`wiki-url`), because `[[...]]` resolves only inside a wiki. Drop personal data — an issue is read by more people than a wiki page. Completion condition: title and body file exist, the body carries the source line, and no `[[...]]` link is left in it.
+4. **Labels come from what the repository already has.** Run `tools/issue.sh labels {repo}`, propose the fitting ones with a reason each, and confirm per `jsc-ask:ask` rules — every option states its impact scope (a label drives filters and board rules, so a wrong one routes the work to the wrong queue). Turn the confirmed names into ids with `tools/issue.sh label-ids`. An empty label list, or nothing fitting: ask whether to create the issue with no label, and record that answer. **Never invent a label that the repository does not have.** Completion condition: the user has confirmed a label set — possibly empty — and its ids are resolved.
+5. **Project board.** Run `tools/issue.sh projects {repo}`. Exit 3 means this Gitea has no board API: say so plainly, and hand the user the board URL the script printed so they can drag the issue in themselves. A board list comes back: let the user pick one per `jsc-ask:ask` rules, attach it, and report the failure verbatim if the attach call is refused. Completion condition: the issue is either attached to a board, or the report states in one line that the board link is still outstanding and who has to do it.
+6. Create the issue: `tools/issue.sh create {repo} {title} {body-file} [--labels {ids}]`. Report the `index=` and `url=` it prints. Completion condition: the issue URL is reported to the user, together with the labels applied and the board status from step 5.
+
+## Rules
+
+- One wiki page, one issue. Splitting a page into several issues is analysis work, not conversion — hand that to `jsc-sdlc:analyze`.
+- The issue body stays Traditional Chinese per the STE100 rule, and keeps the source line at the top.
+- Creating an issue is an outward-facing action: the title, body, labels and board pick are confirmed with the user before the create call, never after.