[WIP] Fix failing GitHub Actions workflow lint

[Copilot]

Fix GitHub Actions Lint Workflow Failure

Root Cause Analysis

The lint workflow was failing for PR #777 (Job ID: 62821781400) because internal/difc/agent.go had a trailing tab character on line 145 (an empty line after a log statement in the GetOrCreate function).

Error from CI logs:

Running gofmt check...
The following files are not formatted:
internal/difc/agent.go
make: *** [Makefile:26: lint] Error 1

Investigation

• PR Extract duplicate HTTP connection error detection into helper function #777 branch itself has properly formatted code ✓
• Main branch has trailing whitespace in internal/difc/agent.go ✗
• GitHub's merge commit for testing inherited the formatting issue from main

Changes Made

• Analyzed workflow logs and identified root cause
• Fixed trailing whitespace in internal/difc/agent.go line 145
• Verified fix with make lint locally - all checks pass

Verification

$ make lint
Running linters...
Running gofmt check...
Linting complete!

Impact

Once this PR is merged into main, PR #777 will pass lint checks when retested, as it will no longer inherit the formatting issue from the base branch.

Original prompt

Fix the failing GitHub Actions workflow lint
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 62821781400
Job URL: https://github.com/github/gh-aw-mcpg/actions/runs/21771735129/job/62821781400

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