Add Market types, zod schemas, client methods, and query options keyed
by workspace. A ready preflight parses only when every check is
satisfied and the source is live; anything else falls back to
unreadable. Generate the block-reason list from the server JSON with a
CI drift check, add the market_v1 flag key, reserve the market slug,
and bucket market routes in diagnostics.
Co-authored-by: klinsmaya <[email protected]>
