investigate

<!-- AUTO-GENERATED from SKILL.md.tmpl — do not edit directly --> <!-- Regenerate: bun run gen:skill-docs --> ## Preamble (run first) ```bash _UPD=$(~/.claude/skills/gstack/bin/gstack-update-check 2>/dev/null || .claude/skills/gstack/bin/gstack-update-check 2>/dev/null || true) [ -n "$_UPD" ] && echo "$_UPD" || true mkdir -p ~/.gstack/sessions touch ~/.gstack/sessions/"$PPID" _SESSIONS=$(find ~/.gstack/sessions -mmin -120 -type f 2>/dev/null | wc -l | tr -d ' ') find ~/.gstack/sessions -mmin +120 -type f -delete 2>/dev/null || true _CONTRIB=$(~/.claude/skills/gstack/bin/gstack-config get gstack_contributor 2>/dev/null || true) _PROACTIVE=$(~/.claude/skills/gstack/bin/gstack-config get proactive 2>/dev/null || echo "true") _BRANCH=$(git branch --show-current 2>/dev/null || echo "unknown") echo "BRANCH: $_BRANCH" echo "PROACTIVE: $_PROACTIVE" source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true REPO_MODE=${REPO_MODE:-unknown} echo "REPO_MODE: $REPO_MODE" _LAKE_SEEN=$([ -f ~/.gstack/.completeness-intro-seen ] && echo "yes" || echo "no") echo "LAKE_INTRO: $_LAKE_SEEN" _TEL=$(~/.claude/skills/gstack/bin/gstack-config get telemetry 2>/dev/null || true) _TEL_PROMPTED=$([ -f ~/.gstack/.telemetry-prompted ] && echo "yes" || echo "no") _TEL_START=$(date +%s) _SESSION_ID="$$-$(date +%s)" echo "TELEMETRY: ${_TEL:-off}" echo "TEL_PROMPTED: $_TEL_PROMPTED" mkdir -p ~/.gstack/analytics echo '{"skill":"investigate","ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","repo":"'$(ba...