feat: keep the Skill tool resident on the first Agent turn and open the slash menu from 、

[Tioit-Wang]

What

Two focused changes on the skill / slash-command path, plus their specs and E2E scenarios.

1. Skill ships with the Agent core tool set — Closes #204

Skill was registered into the deferred catalog, so the first provider request of an Agent turn carried no Skill schema. Two decisions assume the model can call it straight away:

• the # Skills system-prompt section tells the model to load a matching skill before answering (D174);
• a typed /skill-id is answered with a persisted instruction to call Skill { id } (D393 / ADR 0219).

A tool that is absent from the schema cannot be called at all, so both paths paid a ToolSearch round trip before any skill body could load. SKILL_TOOL_NAME now joins AGENT_CORE_TOOL_NAMES, and the catalog description that became unreachable with it is removed.

The registration gate is unchanged: the tool exists only while the skill catalog is non-empty, Plan and Goal still omit it entirely, and every other on-demand capability plus ToolSearch keeps its lazy behavior.

2. An ideographic comma opens the slash menu — Closes #65

The composer only opens the command menu on a leading ASCII /. A Chinese IME produces 、 (U+3001) for that keystroke, so reaching /new, /compact, a mode alias, or a Skill meant switching input methods mid-sentence and switching back.

A 、 committed as the first character of an empty draft is now rewritten to / before trigger detection runs, so the ordinary menu opens with the same filtering, insertion, and send behavior. Only that position is rewritten: a mark anywhere later in the draft stays ordinary punctuation, and the @ file menu is unaffected.

Scope

#142 and #236 (skills missing from the / menu) and #225 (deferred activations) are already fixed on main by 8e838549 and PR #231, so this PR does not redo them and keeps the restore path from #231 covered. It takes only what is still missing: Skill being callable on the first turn — which is what makes ADR 0219's /skill-id flow actually work — and the IME alias.

Validation

Check	Result
pnpm -r --if-present typecheck	clean
vitest run — agent-runtime	356 passed
vitest run — shared	498 passed
vitest run — plugin-sdk / i18n / plugin-devkit / agent-host	224 / 23 / 46 / 34 passed
node --test test/*.test.mjs — apps/desktop	1389 passed, 7 failed
node --test test/composer-ime.test.mjs	4 passed
pnpm -r --if-present lint	all packages clean except apps/desktop
pnpm docs:check	all five touched pairs pass (see below)

Failures that are not from this branch, each reproduced on an unmodified 005c668e tree:

• 7 desktop tests: 4 macOS packaging / notarization, 1 plugin write ledger, 2 sidebar drag and ordering. None of them touch the composer, the runtime tool set, or these specs.
• apps/desktop lint: apps/desktop/src/styles/sidebar-threads.css:100 uses a raw border-radius: 1px; the file is untouched here.
• pnpm docs:check: docs/scripts/check-locales.mjs builds its expected route from path.relative, so on Windows the notice check compares a backslash path against a forward-slash link and reports every pair as invalid. With the separator normalized, 75 of 77 pairs pass and the 2 remaining failures are pre-existing table drift in 04-ux/07-ui-design-system.md and 04-ux/08-component-spec.md. All five pairs this PR touches pass tables, fences, and notices.

E2E scenarios were added to the plan (E2E-254, E2E-255) and not run locally, per the repository rules.

Specs and decisions

• ADR 0230 (Skill residency; amends D174 / ADR 0048 / ADR 0219) and ADR 0231 (IME alias; amends D123 / D139 / ADR 0024), with their index rows.
• Decisions D404 / D405 in 08-meta/decisions-log.md.
• 03-runtime/02-agent-runtime.md §7.1, 03-runtime/03-tools-and-permissions.md §2.1, 04-ux/04-builtin-commands.md §9, all with their zh-CN mirrors.
• E2E-254 / E2E-255 plus traceability rows.

中文摘要

• [Feature] Agent 模式将 Skill 列为核心工具，避免先 ToolSearch / Keep Skill in the Agent core tool set #204：Skill 原先属于「按需工具」，第一个 provider 请求的 schema 里没有它，而 D174 的 # Skills 段落与 ADR 0219 的 /skill-id 都要求模型立刻调用它。现在 Skill 常驻 Agent 核心工具集；注册门槛不变（目录非空才注册、Plan/Goal 仍不提供、其它按需工具与 ToolSearch 保持原状）。
• [Feature] 中文输入法下用顿号「、」自动触发斜杠命令 #65：中文输入法的「、」现在会在空草稿的首字符位置改写为 /，直接打开普通斜杠菜单；草稿其他位置的「、」仍是普通标点，@ 文件菜单不受影响。
• [Bug] Windows客户端无法调用全局技能 #142 / [Bug] SKILL不显示 #236 与 [Bug] 新回合清空按需工具激活，历史 ToolSearch 成功记录仍在上下文 / New prompt drops on-demand activations while ToolSearch history remains #225 已在 main 修复（8e838549、PR fix(agent-runtime): restore on-demand tool activations still in context #231），本 PR 不重复处理。
• 规格、ADR、决策日志与 E2E 场景均已同步（中英双语），并附上本机与既有失败的对照说明。