fix(ai-gateway): improve tool call error reporting

[kilo-code-bot]

Summary

• invalid_tool_call_arguments[].details was being stored as an already-JSON-stringified Zod error message (result.error.message) inside a JSONB column, resulting in doubly-encoded JSON. Switched to z.treeifyError(result.error) so schema mismatch details are structured data.
• Added a new unknown_tool error kind: when the model emits a tool call whose name isn't in the request's tools list, we now record it in invalid_tool_call_arguments instead of silently ignoring it. Wired into chat_completions, responses, and messages paths.
• Modelled toolCallArgumentErrorSchema as a discriminatedUnion on kind: unparseable_json (string message), schema_mismatch (tree object), unknown_tool (no details).

Verification

• `pnpm typecheck`

Visual Changes

N/A

Reviewer Notes

Stored shape of `api_request_log.error` changes for new rows: schema-mismatch `details` becomes a tree object instead of a JSON string, and a new `unknown_tool` variant may appear. Existing rows are unaffected (read paths don't parse `details`). For Anthropic messages, all tool names are tracked as known (including server tools like BashTool that have no `input_schema`) so builtins aren't falsely flagged.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 files)

• apps/web/src/lib/ai-gateway/api-request-log-errors.ts

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_{Reviewed by gpt-5.4-20260305 · 208,400 tokens}