RAG-1300: Add Web Search binding types

[G4brym]

Summary

Adds TypeScript type definitions for the new web_search Workers binding:

• WebSearch — abstract class with single search() method
• WebSearchSearchOptions — query + optional limit
• WebSearchResult — url, title, description?, type, authors?, thumbnailUrl?, faviconUrl?
• WebSearchSearchResponse — results + per-response metadata (query, requestId, latencyMs)

The container types are named WebSearchSearchOptions / WebSearchSearchResponse to avoid a name collision with the pre-existing WebSearchOptions type in ai.d.ts (used by the OpenAI-compatible web_search_options field on Workers AI chat completions).

Design

Discovery-only by design — no snippets, content, or scoringDetails fields. Aligns with Cloudflare Pay-per-Crawl: callers fetch URLs themselves via the global fetch() API if they need bodies, at which point publisher access controls apply.

The wrangler binding is declared as a single object (not an array) — there is exactly one shared web corpus, so there is no name, namespace, or instance to specify:

{ "web_search": { "binding": "WEBSEARCH" } }

Verification

• bazel build //types:types — green
• Regenerated latest + experimental snapshots included

Companion changes

• edgeworker-config-service — web_search binding kind, reader, authorizer, and SubPipeline targeting WebSearchEntrypoint
• workers-sdk — wrangler config schema, validation, miniflare plugin, type generation emitting WebSearch
• websearch-monorepo — websearch-worker app (WebSearchEntrypoint phase-1 echo)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.62%. Comparing base (e899a92) to head (bc9c1b2).
⚠️ Report is 261 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6768      +/-   ##
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- Coverage   70.92%   66.62%   -4.30%     
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  Files         438      402      -36     
  Lines      123626   115914    -7712     
  Branches    19450    19425      -25     
==========================================
- Hits        87685    77231   -10454     
- Misses      24403    27094    +2691     
- Partials    11538    11589      +51     

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