cleanup: remove TUI package and legacy dsh entrypoints

.agents/notes/archived/simplification/2026-07-27-copyable-transcript-no-gutter-bar.i18n.yaml

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+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/archived/simplification/2026-07-27-copyable-transcript-no-gutter-bar.md
+2026-07-27-copyable-transcript-no-gutter-bar.md: a4eca191d28a834b05a6839997aab602852912c0
+2026-07-27-copyable-transcript-no-gutter-bar.zh.md: b1f661cb76bb879e414a0dcfd08fc9349ae070c7

.agents/notes/archived/simplification/2026-07-27-copyable-transcript-no-gutter-bar.md

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+# Agent Note: Copyable TUI transcript without gutter bars
+
+Status: implemented
+Archived: 2026-08-04
+
+English | [中文](2026-07-27-copyable-transcript-no-gutter-bar.zh.md)
+
+## Problem
+
+The TUI grouped user prompts and tool cards behind a colored left-gutter bar (`▌ `) prepended to every body line, and indented assistant and system blocks by one column. Both are per-line prefixes: a terminal mouse drag-select over the scrollback captures the leading `▌ ` or the leading space on each line, so copy-paste of a message, a tool's output, or a code block pulls in decoration the user must strip by hand. The bar was the transcript's only per-message separator, so it could not simply be dropped without another way to tell messages apart.
+
+## Decision
+
+The scrollback carries no per-line prefix. Messages are separated only by a bold, underlined role header in the role color and blank-line spacing, both of which the terminal already inserts around each block. The underline gives each role a distinct visual band without a background fill, so it reads on any terminal theme and never enters the clipboard:
+
+- User and steering prompts (`UserMessageComponent`) are a plain `Container`: a bold, underlined accent `You` / `Steering` header line (via the shared `messageHeader` helper), then the prompt body at column 0.
+- Assistant blocks render a bold, underlined `Assistant` header, then reasoning and text at column 0, with the timing line at the end of the block (the former `paddingX = 1` indent is gone).
+- Tool cards drop the `GutterBox` wrapper. The card status (pending / error / success) colors the whole title line — the status glyph (`◌` / `✕` / `✓`) plus the title text share one color, bold and underlined to match the role headers — instead of a colored bar beside an uncolored title. The body renders unprefixed; body lines still pass through `Text` at the terminal width so overlong raw tool output wraps rather than overflowing.
+- The `GutterBox` class is deleted; nothing else used it.
+
+A drag-select over any of these regions now copies exactly the message text.
+
+## Alternatives considered
+
+- **Keep the bar only on user messages, drop it on tool cards** — leaves tool output, the most-copied region, still polluted. Rejected: the goal is a wholly copyable transcript.
+- **A single top rule or bar on the header line only** — the body copies clean, but selecting the header still captures a glyph, and it reintroduces a decoration character for no distinguishing gain over the underlined role header.
+- **Indent grouped bodies instead of a bar** — leading spaces still enter the clipboard, so it does not solve the copy problem; explicitly ruled out.
+- **A filled background band on the header** (reverse video, or a 256-color muted background) — gives each role a strong color block, but the saturated ANSI fill reads as too heavy and the 256-color shades are fixed rather than theme-remapped. The underline gives per-role distinction with a far lighter footprint.
+
+## Consequences
+
+- Copy-paste from the scrollback is clean with no user post-processing. This was the motivating win.
+- The transcript is flatter than the gutter-bar layout, but each role's bold, underlined header in the role color plus blank-line spacing keeps message boundaries clear without any left-edge fill. Tool-card status stays legible through the colored, underlined glyph and title.
+- Box-drawing borders (`│`) on transient overlays — status panel, model selector, resume list — are untouched. They are not scrollback message content and are rarely copied.
+- The affected keyless TUI `*.expected.txt` snapshots were re-recorded by fixture replay (no API key needed; the recorded LLM sessions are unchanged, only the render differs). Interactive boot and a round-trip prompt were verified in tmux.

.agents/notes/archived/simplification/2026-07-27-copyable-transcript-no-gutter-bar.zh.md

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+# Agent Note: 无 gutter bar 的可复制 TUI transcript
+
+Status: implemented
+Archived: 2026-08-04
+
+[English](2026-07-27-copyable-transcript-no-gutter-bar.md) | 中文
+
+## Problem
+
+TUI 此前把用户提示词和工具卡片分组在一条彩色左侧 gutter bar（`▌ `）之后，该竖条被逐行加在每一行正文前面，并把 assistant 与系统块整体缩进一列。两者都是逐行前缀：在 transcript 上用鼠标框选时，每一行开头的 `▌ ` 或前导空格都会被一并选中，因此复制一条消息、一段工具输出或一个代码块时都会带上装饰字符，用户必须手动清理。该竖条又是 transcript 中唯一的逐条消息分隔标记，所以不能在没有其他区分方式的情况下直接删掉。
+
+## Decision
+
+transcript 不再带任何逐行前缀。消息仅通过以角色色渲染的粗体带下划线角色标题和空行分隔，而这两者本就由终端在每个块前后自动插入。下划线让每个角色获得清晰的视觉分带，且无需背景填充，因此在任何终端配色下都可读，也绝不会进入剪贴板：
+
+- 用户提示词与 steering 提示词（`UserMessageComponent`）改为普通 `Container`：一行粗体带下划线的强调色 `You` / `Steering` 标题（经共享的 `messageHeader` 辅助函数生成），随后是位于第 0 列的提示词正文。
+- Assistant 块渲染一行粗体带下划线的 `Assistant` 标题，随后 reasoning 与文本均在第 0 列渲染，timing 行位于块末尾（原先的 `paddingX = 1` 缩进已移除）。
+- 工具卡片去掉 `GutterBox` 包装层。卡片状态（进行中 / 错误 / 成功）对整行标题着色——状态字形（`◌` / `✕` / `✓`）与标题文本共用一种颜色，并同角色标题一样加粗且带下划线——而不再是未着色标题旁的一条彩色竖条。正文无前缀渲染；正文行仍按终端宽度经 `Text` 处理，使过长的原始工具输出换行而非溢出。
+- `GutterBox` 类被删除；没有其他地方使用它。
+
+现在对上述任一区域框选，复制得到的正是消息文本本身。
+
+## Alternatives considered
+
+- **仅在用户消息上保留竖条、在工具卡片上去掉** —— 会让最常被复制的工具输出仍然带有污染。已否决：目标是让整个 transcript 都可复制。
+- **仅在标题行上加一条顶部横线或竖条** —— 正文复制干净，但选中标题时仍会带上一个字形，且相比带下划线的角色标题并未带来额外的区分收益，却重新引入了装饰字符。
+- **用缩进代替竖条对分组正文缩进** —— 前导空格仍会进入剪贴板，无法解决复制问题；已明确排除。
+- **在标题上使用填充背景带**（反色，或 256 色柔和背景）—— 能给每个角色一块强烈的色块，但饱和的 ANSI 填充观感过重，且 256 色是固定色而非随主题重映射。下划线以远更轻的方式提供了同样的逐角色区分。
+
+## Consequences
+
+- 从 transcript 复制粘贴无需用户做任何后处理。这正是本次改动的核心收益。
+- transcript 比 gutter bar 布局更扁平，但每个角色以角色色渲染的粗体带下划线标题加空行分隔，无需任何左缘填充即可让消息边界保持清晰。工具卡片状态仍通过彩色带下划线的字形与标题保持可读。
+- 临时浮层（状态面板、模型选择器、恢复列表）上的制表符边框（`│`）保持不变。它们不属于 transcript 消息内容，且很少被复制。
+- 受影响的 keyless TUI `*.expected.txt` 快照均通过 fixture 回放重新记录（无需 API 密钥；所记录的 LLM 会话未变，仅渲染不同）。交互式启动与一次往返提示已在 tmux 中验证。