[shenxianpeng]

Description

Small fixes found while testing the plugin on a local Jenkins:

1. No root URL configured (common when Jenkins is set up without the setup wizard): explainError() threw IllegalStateException: Root URL isn't configured yet after the provider had answered, so the step returned nothing and later post steps (a Slack message, say) did not run. An automatic explanation was attached in memory but never saved, so it was gone after a restart, and "View failure output" links started with null. Links are now made from the Jenkins root.
2. Pipeline Graph View before 777 calls the Stages page pipeline-overview, so the Explain Error button never showed there. It does now; the page's markup is the same.
3. includeWorkspaceContext replaced the folder and global custom context of a step that sets none. The workspace files now come on top of it.
4. Auto-fix pull request body: $ or \ in the AI's text (${jackson.version}, $PATH, C:\tools) made buildPrBody throw after the commit, leaving the branch behind. They are kept as text.
5. Auto-fix host detection used contains, so github.company.com or gitlab.company.com was taken for the SaaS and its token sent to api.github.com / gitlab.com when no Enterprise URL was set. Hosts are now compared exactly, and ssh://git@github.com/owner/repo.git and https://github.com:443/... are recognised instead of being taken for Bitbucket Server.
6. Docs: the maxLines help said 0 means unlimited (it means the default, 100), and autoFixTimeoutSeconds: 0 fell back to 60 seconds while the documented default is 120.

Before / After

New tests, run against main (2a5eb46) and this branch:

Check	Before	After
explainError() with no root URL returns the explanation	fails: IllegalStateException	passes
Automatic explanation with no root URL is saved in build.xml	fails: not saved	passes
Step with includeWorkspaceContext still sends the global custom context	fails: dropped	passes
Explain Error page check accepts pipeline-overview	fails	passes
PR body keeps ${jackson.version}, C:\tools, $PATH	fails: IllegalArgumentException	passes
github.company.com, gitlab.company.com not taken for the SaaS	fails: taken for GitHub/GitLab	passes
ssh://git@github.com/acme/my-repo.git, github.com:443 recognised	fails: BITBUCKET_SERVER	passes

Pipeline Overview page of Pipeline Graph View 661 (the version the plugin declares), failed parallel build, user who may build the job:

	Before	After
Desktop
Mobile

After, the explanation is shown above the selected node's steps, as on the Stages page:

Related Issues

None.

Testing done

• New NoRootUrlTest, and new cases in CustomContextTest, PipelineGraphViewDecoratorTest, AutoFixPullRequestBodyTest and ScmRepoTest; all of them fail on main and pass here.
• mvn verify (JDK 21): 907 tests pass, SpotBugs reports no issues.
• On a local Jenkins with an OpenAI-compatible mock and no root URL: the step returns its title, the automatic explanation is in build.xml, and the console link reads /jenkins/job/.../error-explanation/.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests that demonstrate the feature works or the issue is fixed

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Was generative AI tooling used to co-author this PR?

• Yes (please specify below)

[shenxianpeng]

The CI failure is a known issue, pls ref jenkins-infra/helpdesk#5339