refactor: require target for message actions

docs/cli/index.md

@@ -446,8 +446,8 @@ Subcommands:
 - `message event <list|create>`
 
 Examples:
-- `clawdbot message send --to +15555550123 --message "Hi"`
-- `clawdbot message poll --channel discord --to channel:123 --poll-question "Snack?" --poll-option Pizza --poll-option Sushi`
+- `clawdbot message send --target +15555550123 --message "Hi"`
+- `clawdbot message poll --channel discord --target channel:123 --poll-question "Snack?" --poll-option Pizza --poll-option Sushi`
 
 ### `agent`
 Run one agent turn via the Gateway (or `--local` embedded).