Summary

• make resumed CLI sessions show a smarter full recap: short summary + recent tail + /history hint
• add resume_display=tail to preserve the old tail-only behavior when users don't want the summary
• surface continuation-chain context for compressed sessions and expand resume display coverage in tests

Test Plan

• source .venv/bin/activate && python -m pytest tests/test_resume_display.py -q -o addopts=''

Best Validation Path

1. Run:
   source .venv/bin/activate && python -m pytest tests/test_resume_display.py -q -o addopts=''
2. Then do one manual smoke test:
   • start Hermes and have a short multi-turn conversation
   • quit
   • run hermes -c
   • verify the resumed panel shows:
     • Summary:
     • recent You: / Hermes: lines
     • Want the full transcript? Run /history.

Demo

Preferred real demo: a short terminal recording / GIF of:

1. making a brief session,
2. quitting,
3. running hermes -c,
4. pausing on the resumed panel,
5. optionally typing /history.

For this PR, here is the fallback mock demo inline in the description, generated from the actual resumed-session renderer (so it reflects the real panel formatting, but it is not a full end-to-end hermes -c capture):

╭─────────────────────────── Previous Conversation ────────────────────────────╮
│   Summary: 2 user messages so far. recent focus: “What is Python?”; then     │
│ “How do I install it?”. last Hermes reply: “You can install Python from      │
│ python.org.”.                                                                │
│                                                                              │
│   Note: This resumed session is part of a continuation chain; older raw      │
│ history may live in an earlier linked session.                               │
│                                                                              │
│   ● You: What is Python?                                                     │
│   ◆ Hermes: Python is a high-level programming language.                     │
│   ● You: How do I install it?                                                │
│   ◆ Hermes: You can install Python from python.org.                          │
│                                                                              │
│   Want the full transcript? Run /history.                                    │
╰──────────────────────────────────────────────────────────────────────────────╯

Reviewer shortcut:

• read the inline mock demo above for intended UX
• run the targeted test command
• if desired, do the manual hermes -c smoke test for the real experience

Closes #5703