@table params= is accepted and stored but emitted by neither face

[sotashimozono]

@table ... params= is accepted into Table.params (src/document.jl:682, :707).

Neither emitter reads it:

src/themes/agent.jl:148-176      emit_table -- no params in the JSON
src/themes/gallery.jl:1242-1268  emit_table -- no params either

Repo-wide, params on a Table is read in exactly one place: src/testset.jl:1648-1649, which @warns that it is dropped across a shard dump. In an ordinary direct render it is dropped with no warning at all.

A caller who writes @table data params=key, mirroring @figure ... params=key and expecting the same DataVault-lineage treatment CLAUDE.md attributes to params, gets a complete no-op.

Fix

Surface Table.params in agent.json the way _agent_params_json does for Figure, or drop the kwarg and warn at macro-expansion time.