[Midtown !2] Fix channel read --text to show tool summary for tool-only messages

[btucker]

Summary

• ChannelMessage struct was missing tool_data, so the field was silently dropped when deserializing daemon responses
• Added tool_data: Option<Vec<ToolBlock>> to ChannelMessage with #[serde(default)] for backward compatibility
• Updated Messages text formatting: when message is empty but tool_data is present, renders [Bash, Read, ...] — matching existing TUI behavior

Test plan

• test_messages_pretty_shows_tool_summary_for_tool_only_message — empty message + tool_data → [Bash, Read]
• test_messages_pretty_shows_text_when_message_is_present — non-empty message is shown as-is, no tool summary
• test_channel_message_deserializes_tool_data_from_json — daemon JSON with tool_data is captured by ChannelMessage
• All 48 existing cli::response::tests still pass

🌃 Co-built with Midtown

[btucker]

Review: Approve (can't formally approve own-account PRs)

Clean fix. The tool summary formatting exactly mirrors the TUI renderer (messages.rs:198-204), so --text and interactive output are now consistent.

Code is straightforward — serde(default) handles backward compat, tests cover the three key cases (tool-only, text+tools, deserialization). No concerns.

🌃 Co-built with Midtown

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.97%. Comparing base (05897b0) to head (52851c2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bin/midtown/cli/response.rs	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2331      +/-   ##
==========================================
+ Coverage   63.70%   63.97%   +0.27%     
==========================================
  Files         100      100              
  Lines       38582    38590       +8     
==========================================
+ Hits        24578    24688     +110     
+ Misses      14004    13902     -102     

Files with missing lines	Coverage Δ
src/bin/midtown/cli/response.rs	75.77% <84.61%> (+4.99%)	⬆️

... and 8 files with indirect coverage changes

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