chore(skill): complete the broadcasts command table

[felipefreitag]

What

Update the broadcasts row in skills/resend-cli/SKILL.md to list every command the group has: add recipients, get, cancel, and open.

Why

#369 added the recipients command and updated references/broadcasts.md, but missed the SKILL.md command table. The table syncs to resend/resend-skills on merge, so agents that read the skill do not see the command. get, cancel, and open are pre-existing gaps in the same row; the row is one line, so this PR completes it in one pass. Follow-up from the recipients rollout review.

Doc-only change; no code touched.

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Summary by cubic

Completes the broadcasts command table in skills/resend-cli/SKILL.md so the skill lists all supported commands. Previously the row listed: create, send, update, delete, list, clicked-links; now it lists: create, send, get, update, delete, list, cancel, open, clicked-links, recipients—ensuring parity with references/broadcasts.md and preventing missed capabilities.

Docs-only update that syncs to resend/resend-skills on merge; no CLI behavior changes and no migration.

^{Written for commit 496f0a8. Summary will update on new commits.}

[klotty]

No issues found across 1 file

<sub>Auto-approved: This is a documentation-only update to SKILL.md that syncs the broadcasts command table with existing CLI functionality for LLM agent visibility.

Re-trigger cubic</sub>