fix(cli): show shared agent board messages

[marius-kilocode]

What Problem This Solves

The CLI rendered board_post and board_read calls as generic tool output. Board message bodies were hidden unless generic output was enabled, and raw output was not readable.

Why This Change Was Made

Add a dedicated terminal renderer that matches the Agent Manager board-message presentation while preserving terminal conventions. It shows sender and recipient labels, Markdown message bodies, empty reads, pagination warnings, and the post storage receipt. Board cards remain controlled by the existing tool-details setting, but are no longer hidden by the generic tool-output setting.

User Impact

Shared-board activity is readable directly in the CLI, including narrow terminals. Malformed responses still fall back to visible raw output, and tool errors remain visible.

Evidence

• 246 TUI tests passed, with 1 skipped.
• CLI and TUI typechecks passed.
• New renderer tests and existing terminal layout tests passed, 27 tests total in the focused run.
• Annotation and whitespace checks passed.
• Live CLI smoke test passed at normal and narrow widths, including tool-details hide/show behavior.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• .changeset/cli-board-messages.md
• packages/tui/src/kilocode/board-tool.tsx
• packages/tui/src/routes/session/index.tsx
• packages/tui/test/kilocode/board-tool.test.tsx

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