Add docs for promptless suggestions command

[InlinePizza]

Summary

• Designs the promptless suggestions command for triaging docs updates from the terminal. List view shows status, remote, PR, page, trigger, and timestamp; --stat adds a git diff --stat-style per-file breakdown; --id <id> shows full detail.
• Filters and statuses are grounded in the existing api.gopromptless.ai /organizations/{org_id}/doc_updates response shape — statuses are ready / pr_open / published / closed; filters mirror the dashboard's Status / Docs location / Trigger source / Labels / free-text controls.
• Adds an index.md and commands.md modeled on the foo/docs style, since the existing docs/ only covered auth.
• Documents that a Promptless API key is implicitly scoped to one organization, so no command takes an --org flag.

Test plan

• Confirm the four documented statuses match what the dashboard renders.
• Confirm the filter dimensions (--status, --location, --trigger, --label, --assignee, --page, --since, --until, -q) cover every dashboard filter without over-promising.
• Confirm the response fields named in the JSON section (pr_status, closed_at, impacted_files, trigger_events, collection_name, docs_platform, last_sha, etc.) match the /organizations/{org_id}/doc_updates payload.
• Confirm the per-suggestion diff endpoint used by --stat (/organizations/{org_id}/change-history/{id}/diff) is the right route, or update the doc with the actual one before implementation.
• Sanity-check the relative links between index.md, commands.md, suggestions.md, and the existing configuration.md / environment-variables.md / cli-auth-protocol.md.

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