chore(gitea): 技能依結束碼分流，可併行的步驟改成同時跑

技能以前只寫成功路徑。腳本回非 0 時，模型得自己猜下一步，猜錯就是靜靜
往下走。現在每一支腳本在檔頭宣告自己的結束碼，技能也逐碼寫明要停、要
問、還是要改參數再呼叫一次。兩支技能補上連線變數的解析步驟，讓缺值在
第一步就浮出來，而不是在中途撞出一行英文錯誤。

流程也拉平了。取內容、選範本、問輸出位置這幾件事彼此不相依，改成同一批
送出；存取庫批次同步從逐一處理改成各存取庫同時進行，一個 owner 底下有
上百個存取庫時差距最明顯。

相依的技能組下限寫進外掛設定，版本推進。

skills/html-style/SKILL.md

@@ -10,10 +10,10 @@ One kind of page, one layout, one style. `jsc-gitea:html-export` reads what this
 ## Steps
 
 1. **Settle the kind key.** Show the current configuration with `tools/html-style.sh list` first, then ask per `jsc-ask:ask` rules which kind this run sets. The three shapes are fixed: `WIKI:{page-name prefix}` (`WIKI:PLAN`, `WIKI:ANALYZE`, `WIKI:LOG` …), `ISSUE:{label name}` (`ISSUE:bug`), and `DEFAULT` for everything that matches nothing else. Every option states its impact scope — `DEFAULT` changes every kind that has no row of its own. Completion condition: exactly one key is agreed, and its current value from `tools/html-style.sh get {key}` has been read back with its source column.
-2. **Pick the layout — offer all six.** Run `tools/html-style.sh layouts`; it prints each name with its Traditional Chinese description, taken from the template file itself. Present all six as options per `jsc-ask:ask` rules, each with what it does to the content (`report` builds a table of contents beside the text, `slide` turns every `##` into a keyboard-flipped page, `dashboard` turns them into cards, `spec` freezes table headers, `timeline` strings them along a line, `onepager` narrows everything into one printable page). Completion condition: the user has picked one layout name that the script listed.
+2. **Pick the layout — offer all six.** Run `tools/html-style.sh layouts`; it prints each name with its Traditional Chinese description, taken from the template file itself. `list`, `get`, `layouts` and `styles` exit 2 on a usage error — fix the arguments and call again. An empty listing means the template directory is missing, which stops this skill: report the path rather than offering a name the export cannot use. Present all six as options per `jsc-ask:ask` rules, each with what it does to the content (`report` builds a table of contents beside the text, `slide` turns every `##` into a keyboard-flipped page, `dashboard` turns them into cards, `spec` freezes table headers, `timeline` strings them along a line, `onepager` narrows everything into one printable page). Completion condition: the user has picked one layout name that the script listed.
 3. **Pick the style — offer all five.** Run `tools/html-style.sh styles` and present every one it prints (`minimal`, `corporate`, `dark`, `print`, `vivid`) with its description. Never trim the list to a shortlist: the point of this skill is that the user sees the whole set. Completion condition: the user has picked one style name that the script listed.
 4. **Pick the scope.** Ask per `jsc-ask:ask` rules: `--project` writes `./.jsc/html-styles`, which only applies inside this working directory and is committed with the repository; `--global` writes `$JSC_HOME/html-styles.conf`, which follows the user across every project on this machine. State that the project file wins whenever both hold the same key. Completion condition: the user has picked one scope.
-5. Write it: `tools/html-style.sh set {key} {layout} {style} [--project|--global]`. Exit 4 means the name is not one of the listed templates — go back to step 2 or 3 rather than editing the file by hand. Completion condition: the script exits 0 and prints the file it wrote.
+5. Write it: `tools/html-style.sh set {key} {layout} {style} [--project|--global]`. Route every exit code: 0 → the file it printed now holds the pair; 1 → the settings file's directory could not be created, so report the path and stop, since nothing was written; 2 → a usage error, such as a missing name or a scope flag that is neither `--project` nor `--global`, so fix the arguments and call again; 4 → the layout or style name has no template file, so go back to step 2 or step 3 rather than editing the settings file by hand. Completion condition: the script exits 0 and prints the file it wrote.
 6. Read it back with `tools/html-style.sh get {key}` and report the resolved layout, style and source. Completion condition: the source column shows `project` or `global`, matching the scope chosen in step 4.
 
 ## Rules