standup

Optional argument: send skips the review and DMs the standup right away.

1. Send now. With send, run agent-standup and report whether
   ~/.local/state/agents/standup/log ends with standup sent or
   standup skipped. Stop.
2. Draft. Run agent-standup --print. On empty output, read the log's
   last lines. standup skipped means no Claude session or GitLab activity
   today; say so and stop. Otherwise report the logged error and stop.
3. Show. Print the draft verbatim in a text code block, so the user sees
   the exact Slack markup. Each section groups its bullets under a bold
   project label. Under the block, add one line: the count of linked worktrees
   whose oldest unpushed commit is older than 14 days (read-only):
   find ~/Projects -maxdepth 6 \( -name node_modules -o -name .worktrees \) -prune -o -name .git -type d -print -prune | while read -r g; do git -C "${g%/.git}" worktree list --porcelain | sed -n 's/^worktree //p' | tail -n +2; done | while read -r w; do t=$(git -C "$w" log HEAD --not --remotes --format=%ct 2>/dev/null | tail -1); [ -n "$t" ] && [ $(($(date +%s)-t)) -gt 1209600 ] && echo "$w"; done | wc -l.
   Keep it out of the Slack text. Offer worktree-cleanup to review the list.
   Then ask for edits or send.
4. Edit. Apply each requested edit to the draft and show it again. Keep
   the <url|label> Slack link syntax, the Done, Next, Blocked sections, and
   the project labels.
5. Send. On send, DM the final text with slack_send_message, using the
   user's own Slack user ID from the Slack tool description as channel_id.
   Without a Slack tool, say so and leave the text in chat to paste. Report the
   message link.