feat(hooks): add /caveman status command to report active mode

[Cna59]

Feat - Add /caveman status

PR Description

Before: No way to check which caveman mode is active. User switches to ultra, forgets,
has no command to verify.

After: /caveman status reports current active mode:

# When ultra is active:
> /caveman status
→ "Current caveman mode: ultra"

# When inactive:
> /caveman status
→ "Caveman mode is currently off"

New feature — read-only status query via hook. No flag writes, no mode changes.

Why: Users switching between modes (lite/full/ultra/wenyan) need a way to check what's
currently active without guessing from output style.

Files changed

• hooks/caveman-mode-tracker.js — add status branch, emit mode via hookSpecificOutput
• skills/caveman/SKILL.md — document /caveman status
• skills/caveman-help/SKILL.md — add "Check Active Mode" section
• CLAUDE.md — document status command in hook reference

Test

Case 1 inactive:

echo '{"prompt":"/caveman status"}' | CLAUDE_CONFIG_DIR="$(mktemp -d)" node
hooks/caveman-mode-tracker.js

Case 2 active (ultra):

D=$(mktemp -d) && echo "ultra" > "$D/.caveman-active" && echo '{"prompt":"/caveman
status"}' | CLAUDE_CONFIG_DIR="$D" node hooks/caveman-mode-tracker.js