feat(tui): left-align start page, enrich tool result & sub-agent rendering#3
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…ering Start page: the welcome key column is now flush-left (padRight) instead of right-aligned, so commands and their descriptions share a clean left edge. Tool results: tool_result now retains a sanitized, line-capped excerpt (resultPreview) instead of a single collapsed line. renderSteps draws it as a tree (⎿) — multi-line, blank-stripped, capped at 5 lines with a "+N more lines" footer — and tints the status glyph ✗ when the output reads as a failure (looksLikeError). argPreview now also surfaces prompt/task/description fields so delegations show their task. Sub-agents: a delegating tool_call is flagged via isSubagent and labelled "sub-agent"; subsequent subagent_log events nest beneath it as its own branch of the step tree (attachSubLog), falling back to a notice when there is no wrapping step. Tests cover padRight, isSubagent, looksLikeError, resultExcerpt, resultPreview, sub-agent log nesting, and the enriched step rendering; internal/tui statement coverage holds at 96%+. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UHpZVF8Lm1cyZXM6L4a6vn
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Start page: the welcome key column is now flush-left (padRight) instead of
right-aligned, so commands and their descriptions share a clean left edge.
Tool results: tool_result now retains a sanitized, line-capped excerpt
(resultPreview) instead of a single collapsed line. renderSteps draws it as a
tree (⎿) — multi-line, blank-stripped, capped at 5 lines with a "+N more
lines" footer — and tints the status glyph ✗ when the output reads as a
failure (looksLikeError). argPreview now also surfaces prompt/task/description
fields so delegations show their task.
Sub-agents: a delegating tool_call is flagged via isSubagent and labelled
"sub-agent"; subsequent subagent_log events nest beneath it as its own branch
of the step tree (attachSubLog), falling back to a notice when there is no
wrapping step.
Tests cover padRight, isSubagent, looksLikeError, resultExcerpt,
resultPreview, sub-agent log nesting, and the enriched step rendering;
internal/tui statement coverage holds at 96%+.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01UHpZVF8Lm1cyZXM6L4a6vn