feat(cli): persist resolved approval/clarify prompts in scrollback

[teknium1]

Summary

Resolved approval and clarify prompts now leave a one-line record in CLI scrollback, so the question and the decision survive the panel repaint.

Requested on Discord: modal prompt panels (dangerous-command approval, clarify) live in the prompt_toolkit layout and vanish on the next repaint — afterwards there is no trace of what was asked or what the user chose.

Changes

• cli.py: new _persist_prompt_summary() helper; called on approval resolution (⚠ Approval: <command> → allowed for session / denied / …) and clarify resolution (? Clarify: <question> → <answer>). Detail/outcome whitespace-collapsed and capped at 120 chars. Timeout paths already printed their own line.
• cli.py + hermes_cli/config.py: display.persist_prompts config key (default true); set false to keep scrollback untouched.
• tests/cli/test_cli_approval_ui.py: 4 new tests — approval summary, long-command truncation, config-off suppression, clarify summary.

Validation

	Before	After
Approve a dangerous command	panel vanishes, no record	⚠ Approval: rm -rf /tmp/scratch → allowed for session
Answer a clarify question	panel vanishes, no record	? Clarify: Pick a path? → B
display.persist_prompts: false	—	no summary printed

tests/cli/test_cli_approval_ui.py: 22/22 passed.

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