Adds theme-aware v1 builders for cookie_banner, data_table_row,
date_picker, drawer_shell, empty_state, event_card, fab, faq_item,
filter_group, and form_field. Group A (zero-color: empty_state,
form_field) — no hardcoded colors in v0, all three modes identical.
Group B (fab) — accent bg is brand-invariant, maps to accent token
in dark/system; icon stays white in all modes. Group C (remaining 7)
— surface/text/border/accent tokens applied in dark/system modes, full
byte-parity with v0 in light mode.
Creates ext-6 shard (ext-5 was at 798-line ceiling) housing all 10
new tool schema definitions (357 lines). All 9 touchpoints wired per
playbook: builder, index.ts, pen-core barrel, handler, dispatcher,
ext-6 shard, client shim, server builder, elements.md entries.
Verified: format:check clean, tsc --noEmit clean, 4076/4076 tests pass.
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