fix: remove redundant type field from web_search tool schema

[octo-patch]

Fixes #1010

Problem

The web_search action schema included a redundant type: z.literal('web_search') field. When this schema is serialised to JSON Schema (via z.toJSONSchema), the resulting object requires the LLM to include {"type": "web_search", "queries": [...]} in its tool call arguments — even though the function name already identifies which tool is being called.

Some Ollama-hosted models that support tool use (e.g. LFM2) do not include this superfluous type field in their generated tool call arguments. When Ollama validates the arguments against the schema, the call fails silently. The researcher loop then sees zero tool calls after the first iteration, breaks immediately, and the writer generates a response with no search context. This explains the symptoms reported in #1010:

• Brainstorming section never resolves
• No sources listed
• No research progress shown
• No citation numbers in the answer

The same underlying schema issue was also identified for Groq providers (#980).

Solution

Remove the type: z.literal('web_search') field from actionSchema. The execute handler never reads input.type — it only accesses input.queries — so this is a safe, non-breaking change. The resulting schema is simpler and compatible with a wider range of models.

Testing

• TypeScript compilation passes (npx tsc --noEmit)
• Models that previously skipped tool calling due to schema validation (e.g. LFM2 via Ollama) should now correctly issue web_search tool calls and receive proper search results

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Summary by cubic

Remove the redundant type field from the web_search action schema to stop tool-call validation failures with some models. This restores researcher tool calls so brainstorming completes and sources/citations appear.

• Bug Fixes
  • Removed type: z.literal('web_search') from actionSchema; schema now only requires queries.
  • Avoids silent JSON Schema validation failures in models that omit the extra field (e.g., LFM2 via Ollama, Groq providers).

^{Written for commit e6ee0e6. Summary will update on new commits.}

[cubic-dev-ai]

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