Fix linting issues in staging branch

[devin-ai-integration]

Fix linting issues in staging branch

This PR fixes several linting issues detected by golangci-lint:

1. Fixed Task struct field access in model/task.go by accessing fields through the embedded Task struct.
2. Added missing types in composite literals in pkg/erc4337/userop/object.go and pkg/erc4337/preset/builder.go.
3. Fixed range over constant error in core/taskengine/engine_test.go.
4. Fixed protojson.Marshal usage with *Task in model/task.go.

Link to Devin run: https://app.devin.ai/sessions/8779c91a69c049c28706e937cb852d29
Requested by: Chris Li (chris@avaprotocol.org)

[devin-ai-integration]

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[Copilot]

Pull Request Overview

This PR fixes several linting issues in the staging branch. The changes include standardizing import alias usage, correcting field accesses through the embedded Task struct, updating composite literal syntax in ABI argument definitions, and adding environment variable checks in tests alongside a corrected range loop.

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/erc4337/userop/parse.go	Standardized the import alias for the validator package.
pkg/erc4337/userop/object.go	Updated composite literal syntax for ABI arguments to fix linting warnings.
pkg/erc4337/preset/builder_test.go	Added environment variable checks to skip tests and ensured proper test logging.
pkg/erc4337/preset/builder.go	Standardized the import alias for the ethereum package.
operator/worker_loop.go & operator/operator.go	Standardized the import alias for the gocron package.
model/task.go	Adjusted Task struct field accesses to use the embedded Task for protojson marshaling.
core/taskengine/*	Fixed range iteration and standardized import alias usages across various test and engine files.