Ship weknora-shared and weknora-rag-search Agent Skills (SKILL.md plus
references) so an agent driving the CLI learns the auth flow, output contract,
exit codes, and the chat vs session-ask vs search distinction without scraping
help text.
Add CI drift guards that keep the skills honest: every ```weknora``` block must
reference a live command/flag (skillparity), and every MCP tool named in a
skill must exist in the registry (skill_tool_parity).
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