chore: remove stale test and typecheck configuration

[ananjan-nandi-9]

Summary

• Removes an unused workspace_component pytest marker registration.
• Deletes a permanently skipped, bodyless nested-device test whose live replacement already enforces the current contract.
• Drops a mypy override for the old shepherd_core.export.atif module while preserving the active shepherd_export.atif override.

Motivation / Context

These entries survived earlier moves and behavior changes but no longer affect a live code or test path. Removing them keeps marker output, device coverage, and type-check configuration aligned with the current repository without changing runtime behavior.

This is a tailored public cleanup; internal-only ledger and documentation-script changes are intentionally excluded.

Delta Breakdown

1. Remove the orphan marker. workspace_component is registered but is not applied to or selected by any public test.
2. Remove the dead skipped test. The deleted test has no body and is permanently skipped because nested devices are prohibited; test_device_context_nested_raises_error remains and passes.
3. Remove the stale type override. The old shepherd_core.export.atif module no longer exists. The live shepherd_export.atif override remains unchanged.

Entry Point

Root mypy configuration → dialect pytest marker configuration → runtime device test cleanup.

There is no runtime or public API entrypoint.

Review Guide

Reviewers should verify that each removed entry is genuinely unreferenced and that the surviving replacement is the intended contract. In particular, this PR does not remove the active export override and does not change the nested-device prohibition.

Validation

• Static checks: Ruff check and format check passed for the changed Python file; uv lock --check and git diff --check passed.
• Type checks: Not run; the removed override targets a module path that no longer exists.
• Tests: All 24 remaining device-infrastructure tests passed, including test_device_context_nested_raises_error.
• Targeted/manual validation: Confirmed the marker has no uses, the stale module path has no live module, and make verify imports all workspace packages successfully.
• Not run: The Linux baseline on this independent branch retains the public main clonefile limitation addressed by the separate carrier PR.

Documentation / Changelog / Decisions

No changelog or documentation update is needed because this removes inert configuration and a dead skipped test without user-visible behavior.

Risk / Rollback / Migration

Risk is near-zero: all removals were inert or redundant. Rollback is a normal revert. No migration or compatibility action is required.

Follow-ups

None.

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