feat: add task result retrieval for workflow executions

[davidHaunschmied]

Closes #71

What this PR does

Adds support for reading the return value of individual task executions via the GET /platform/automation/v1/executions/{id}/tasks/{taskName}/result endpoint.

Changes

pkg/resources/workflow/execution.go

• Add GetTaskResult(executionID, taskName string) (any, error) — thin wrapper around the task result API endpoint, consistent with the existing GetTaskLog() pattern.

cmd/get_wfe_task_result.go — new get sub-resource

dtctl get wfe-task-result <execution-id> --task <task-name>
dtctl get workflow-execution-task-result <execution-id> --task <task-name>

Requires --task. Respects -o json/yaml/table via the standard Printer.

Per feedback in #71, this lives under get (not a separate results verb) to stay consistent with existing patterns like dtctl get wfe and dtctl logs wfe.

cmd/exec_workflows.go — new --show-results flag

dtctl exec workflow <id> --wait --show-results

After the workflow completes, lists all tasks and prints each task's return value. Only valid with --wait.

docs/QUICK_START.md

• Added --show-results example under Execute Workflows
• Added "View Task Results" section with get wfe-task-result examples

pkg/resources/workflow/execution_test.go

• Unit tests for GetTaskResult (success, 404, 500) using the repo's newExecTestHandler pattern

Example output

$ dtctl get wfe-task-result 8ffa5b11 --task rca_analysis -o json
{
  "results": [ ... ]
}

$ dtctl exec workflow eeca623c --wait --show-results

Workflow execution started
Execution ID: 8ffa5b11-...
State: RUNNING

Waiting for execution to complete...

Execution completed
Final State: SUCCESS
Duration: 7s

Task Results:

--- fetch_active_events [SUCCESS] ---
(DQL task — no structured return value)

--- rca_analysis [SUCCESS] ---
{
  "results": [
    {
      "serviceId": "SERVICE-BE4453718DDF0511",
      "eventStart": "2026-03-07T19:35:00.000Z"
    }
  ]
}

[dynatrace-cla-bot]

All committers have signed the CLA.

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Codecov Report

❌ Patch coverage is 10.20408% with 44 lines in your changes missing coverage. Please review.
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Files with missing lines	Patch %	Lines
cmd/exec_workflows.go	5.55%	17 Missing ⚠️
cmd/results.go	19.04%	16 Missing and 1 partial ⚠️
pkg/resources/workflow/execution.go	0.00%	10 Missing ⚠️
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Additional details and impacted files

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[davidHaunschmied]

Updated PR based on your feedback @discostu105 . Please have another look.