Add a session-scoped contextual tips system that shows non-intrusive
hints when user behavior suggests they'd benefit from knowing a feature.
Tips:
- Shell command prefix: nudge when bare ls/git/npm typed without !
- Large paste: warn when >2000 char input sent to agent
- Thinking level: hint when short question with high/xhigh thinking
- Double-bang reminder: after 3+ single-! commands, suggest !!
- Compaction nudge: when context >= 70% full
Each tip fires at most N times per session, resets on /new.
Wired into both TUI (dim inline text) and web terminal (system line).
31 unit tests covering all tips, suppression, reset, and priority.
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