chore(go.mod): bump coder/coder to latest main

[ethanndickson]

Bumps github.com/coder/coder/v2 from the previously pinned main commit (db7f4438b4ad, 2026-07-01) to the current main HEAD (9af3d31036bf07a00f827c9fd4e6a7126f806345).

Resulting module version: v2.34.0-rc.0.0.20260710073612-9af3d31036bf

go mod tidy pulled in the corresponding transitive dependency updates. go build ./... passes.

Opened by Coder Agents on behalf of @ethanndickson.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve reasoning effort fields during SDK bump

With this SDK version, reasoning effort moved out of per-provider options (ChatModelAnthropicProviderOptions.Effort and OpenAI provider_options.*.reasoning_effort were removed, while ChatModelCallConfig.ReasoningEffort was added). coderd_agents_model.model_config decodes and canonicalizes user JSON through that SDK struct, so the currently documented config in examples/resources/coderd_agents_model/resource.tf using provider_options.anthropic.effort now silently drops effort on create/update and Terraform considers the resulting state semantically equal. Please either migrate/accept the old shape explicitly or update the example/docs and validation so users do not lose configured reasoning effort without a plan-time error.

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