ui: lead the launcher with the prompt and one configuration line

[hbrooks]

Important

Restructures the launcher's layout: the prompt now leads, followed by a one-line configuration summary, then the session list, with the "connected to" line moved to the bottom.

• Launcher layout now leads with the prompt as the first actionable row, where ↓ descends to a summary line that shows what the next run will use (model, repo count, custom Dockerfile, environment variables).
• Configuration editor swaps in place of the session list when you press enter on the summary line, so you can change model/repos without growing the launcher height.
• Token display removed from session rows — compactTokens() deleted, rowMeta() now shows only cost and age, never token counts.
• UI test suite removed — test/screenshot.test.ts, test/connect-render.test.ts, test/scrollback.test.ts and their snapshots deleted; @xterm/headless dependency removed. Added CLAUDE.md documenting that tests must cover pure functions only, not UI rendering.
• New configSummary() function reads the saved config's Dockerfile and variables (which the pickers can't reach directly) and the current model/repo picks to produce a one-line summary.

^{This description was created by for 2c32688. It will automatically update as commits are pushed.}

[ellipsis-dev]

Caution

Changes requested ❌ — 2 issues

Reviewed 2c32688 in 4 minutes, 50 seconds.

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[ellipsis-dev]

The summary line names the account-default model even when the selected Agent config declares its own claude.model, so it reports a model the run will not use; the config's model should win whenever the Model row is untouched (modelPick === null).

With GET /models returning a model flagged is_default_agent_model, composerModelOptions gives that row the null id but its raw id as the label, so an untouched Model row makes pickedModelLabel a real id (e.g. claude-opus-5), never the string Default. configSummary therefore takes input.model and never reaches its agentConfig.claude.model fallback. Pick an Agent config whose YAML sets claude: {model: claude-haiku-4-5-20251001}, leave the Model row alone: submit() sends no model override (modelOptions[modelIdx].id is null), the server resolves haiku from the config, and the launcher line says claude-opus-5. Note the repos bit gets this precedence right — untouched means null, and the config's environment.repositories answers. Fix needs both ends: pass model: modelPick === null ? null : pickedModelLabel and give configSummary a defaultModel argument it falls back to after the config's own model, so the untouched-row-with-no-config case still names the account default.

[ellipsis-dev]

Typing while the editor is open moves the cursor to the prompt but leaves editing true, so the session list stays hidden and the esc: back to your sessions hint below it does nothing — setEditing(false) belongs in toPromptWith.

Press ↓, enter (editor opens), then type any character: toPromptWith sets the cursor to prompt while editing stays true, so showList is false and the status line still reads esc: back to your sessions (line 926). At the prompt, esc hits if (key.escape || key.ctrl || key.meta || key.tab) return and is a no-op, so the list only comes back by pressing ↓ and then esc.