Adds the agent-facing surface for the new Tantivy lexical search service
(arcadia-search). Sits alongside the existing search_docs (browser
MiniSearch) — agent picks based on tool description.
- admin-tools.ts: new search_kb(query, corpus, limit?, tags?) and
read_chunk(chunk_id, corpus) tools. KB_BASE_URL honors
window.__ARCADIA_SEARCH_URL runtime override + VITE_ARCADIA_SEARCH_URL
build env, defaults to localhost:7800. Token resolved per-call from
sessionStorage.arcadia_access_token (matching lib-arcadia-client's
storage convention) with "dev" fallback for unauthenticated dev.
- assistant.tsx: system-prompt section telling the agent when to pick
search_docs (browser, bundled) vs search_kb (server, dynamic +
expandable via read_chunk).
- ai.tsx: reindexKB() helper + "reindex kb (docs)" button on the empty
state, next to the existing block-preview button. Toasts on
start/success/failure. Wired with data-action="kb-reindex-docs" so
the agent can also trigger via the command bus.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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