Docs: `cli-reference.mdx` Output Formats section omits `plain` and the `yml` / `markdown` aliases

[rajarshidattapy]

Description

docs/cli-reference.mdx:56-62 lists five output formats: table, json, yaml, md, csv.

The supported set is eight (src/command-surface.ts:5):

export const OUTPUT_FORMATS = ['table', 'plain', 'json', 'yaml', 'yml', 'md', 'markdown', 'csv'] as const;

• plain is implemented at src/output.ts:50 and advertised in adapter --help text at src/command-presentation.ts:87 ("Output format: table, plain, json, yaml, md, csv").
• yml and markdown are accepted aliases for yaml and md (src/output.ts:51-55).

skills/webcmd-usage/SKILL.md:93 already documents plain ("prints the primary text field for chat-style commands"), so the agent-facing skill and the human-facing reference disagree.

Impact

plain is the right format for chat-style adapter output and is invisible to anyone reading the published reference.

Suggested fix

Add webcmd hackernews top -f plain to the example block and a line noting that yml and markdown are accepted aliases.