fix: use opaque Comms IDs in help examples

[jacobo-doist]

Summary

• replace numeric-looking Comms entity IDs in command help examples with opaque id: refs
• update reference docs to clarify numeric IDs are for users/workspaces while most Comms entities use opaque strings
• regenerate the bundled comms-cli skill file

Testing

• npm run sync:skill
• npm run type-check
• npm run lint:check
• npm run check:skill-sync
• npm test
• built help smoke checks for conversation/thread/view

[doistbot]

This PR updates Fix opaque Comms IDs in help examples. No issues were flagged in the reviewed diff.

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