Preserve continue-on-error on generated agent jobs

[Copilot]

The compiler accepted jobs.agent.continue-on-error but silently omitted it from generated workflows. Explicit boolean values are now preserved, while unsupported built-in jobs produce an actionable error.

• Compiler behavior

  • Apply continue-on-error to the generated agent job.
  • Preserve explicit true and false values.
  • Support imported job configuration.
  • Reject the field on other built-in jobs.

• Coverage and documentation

  • Add parsed-YAML regressions for agent, imported, omitted, unsupported, and custom-job configurations.
  • Document built-in job support.

jobs:
  agent:
    continue-on-error: true

• Fixes Compiler silently drops jobs.agent.continue-on-error #60313

[Copilot]

🟢 Approval recommended

The focused implementation preserves explicit booleans, rejects unsupported usage, and includes comprehensive regression coverage.

Pull request overview

Fixes silent loss of jobs.agent.continue-on-error during workflow compilation.

Changes:

• Preserves explicit true and false values for generated agent jobs.
• Rejects the field on unsupported built-in jobs.
• Adds regression coverage and reference documentation.

File summaries

File	Description
pkg/workflow/compiler_builtin_job_augmentation.go	Applies and validates the job setting.
pkg/workflow/compiler_agent_job_continue_on_error_test.go	Covers direct, imported, omitted, unsupported, and custom-job cases.
docs/src/content/docs/reference/steps-jobs.md	Documents built-in job support.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Balanced

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[pelikhan]

@copilot make sure it works with imports where the main workflow file wins