fix(resume): Show resume hint for any conversation

[CSRessel]

Summary

🤖 Generated with Nori

• Decouple the post-exit nori resume <session-id> hint from token usage so ACP sessions without token reports still show the resume command when the session recorded activity.
• Render resume hints as two lines, with To continue this session, run: followed by a standalone nori resume <session-id> command for easier copying.
• Share the resume hint lead text and command construction between the post-exit CLI output and the in-TUI new-conversation summary, and update snapshots/docs for the aligned behavior.

Test Plan

• cargo test -p nori-cli
• cargo test -p nori-tui
• cargo build --bin nori
• cargo test -p tui-pty-e2e
• just fmt
• just fix -p nori-cli
• just fix -p nori-tui
• cargo insta pending-snapshots
• Live tmux TUI check with ElizACP: prompt appeared, accepted hello, exited, and printed the two-line resume hint with the nori resume <session-id> command on its own line
• GitHub CI green: cargo-deny, Linux checks, macOS checks

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