Surface SessionStart hook file reads in welcome screen

What I'd like

When a SessionStart hook reads files (e.g. cat ~/.claude/FRAMEWORK.md), I'd like to see which files were read somewhere visible on the welcome screen — ideally in the "Recent activity" area, or a new "Session context loaded" section.

Example

My settings.json has SessionStart hooks that inject context:

"SessionStart": [{
  "hooks": [
    { "type": "command", "command": "cat ~/.claude/FRAMEWORK.md" },
    { "type": "command", "command": "[ -d .jj ] && cat ~/.claude/hooks/jj_prime.md 2>/dev/null || true" }
  ]
}]

When a session starts, the content is injected into the system-reminder (great), but I have no visible indication of which files contributed to the session context. The welcome screen shows:

Recent activity
No recent activity

I'd love to see something like:

Session context loaded
  ~/.claude/FRAMEWORK.md
  ~/.claude/hooks/jj_prime.md

What I've tried

• Adding a separate hook with echo 'SessionStart read: ~/.claude/FRAMEWORK.md' — this goes into the system-reminder context alongside the file contents, but doesn't surface anywhere visible on the welcome screen.
• Prefixing the cat with an echo header — same result, just adds noise to the injected context.

Why this matters

When you have multiple conditional hooks (e.g. jj-specific context only loads in jj repos), it's useful to confirm at a glance which context was actually loaded for this session.