fix(coderd/x/chatd/chatsanitize): sanitize web_search history for non-Anthropic providers#25593
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…-Anthropic providers Bedrock shares Anthropic's message format but rejects web_search_tool_result blocks with HTTP 400, so switching from Anthropic to Bedrock mid-chat fails. Strip provider-executed tool calls and convert results to text when the target provider is not Anthropic.
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Switching providers mid-chat from Anthropic to Bedrock currently fails because Bedrock shares the Anthropic message format but rejects
web_search_tool_resultblocks with HTTP 400.Add
SanitizeUnsupportedProviderToolHistorywhich strips Anthropic provider-executed tool calls and converts their results to plain text whenever the target provider is not Anthropic. Wired in alongside the existing Anthropic sanitization in the chatloop pre-request path and in chatd's persisted/reloaded history replay paths.