fix: emit workflow.submitted on run submission

[kartikeya-27]

EventType.WORKFLOW_SUBMITTED was defined but never emitted. It now fires from submit_workflow with {run_id, workflow_name}, and from sub-workflow submission with parent_run_id added.

Also fixes the events guide: worker event payload fields corrected (worker_id/queues, not hostname) and the workflow/saga/predicate events added to the payload table.

Regression tests: submit emits the event without a worker; child submission carries parent_run_id.

Part of #535.

Summary by CodeRabbit

• New Features

  • Added WORKFLOW_SUBMITTED events for queued workflows and child workflows.
  • Submission events include workflow names, run identifiers, and parent run identifiers when applicable.
  • Expanded lifecycle event coverage for workflow completion, failure, cancellation, compensation, and predicate outcomes.

• Documentation

  • Updated the event reference with new lifecycle events and revised worker and queue event payload details.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6a62869c-2dcf-4fbe-935c-47168ff16fcb

📥 Commits

Reviewing files that changed from the base of the PR and between eb47e8d and e3c1f27.

📒 Files selected for processing (2)

• sdks/python/taskito/workflows/mixins.py
• sdks/python/tests/workflows/test_workflows_subworkflow.py

📝 Walkthrough

Walkthrough

Changes

Workflow submission events

Layer / File(s)	Summary
Queue submission event contract and emission docs/content/docs/python/guides/extensibility/events-webhooks.mdx, sdks/python/taskito/workflows/mixins.py, sdks/python/tests/workflows/test_workflows_linear.py	The event catalog is expanded, queue submission emits WORKFLOW_SUBMITTED with run_id and workflow_name, and linear workflow tests validate dispatch before worker startup.
Sub-workflow submission event emission sdks/python/taskito/workflows/tracker/sub_workflows.py, sdks/python/tests/workflows/test_workflows_subworkflow.py	Sub-workflow submission emits child and parent run metadata, while tests verify the event and child workflow name.

Estimated code review effort: 2 (Simple) | ~10 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant QueueWorkflowMixin
  participant EventBus
  participant SubWorkflowTracker
  Caller->>QueueWorkflowMixin: submit_workflow()
  QueueWorkflowMixin->>EventBus: emit WORKFLOW_SUBMITTED with run_id and workflow_name
  SubWorkflowTracker->>EventBus: emit WORKFLOW_SUBMITTED with child_run_id and parent_run_id

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Suggested reviewers: pratyush618

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: emitting WORKFLOW_SUBMITTED when a workflow run is submitted.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Create PR with unit tests
• Commit unit tests in branch fix/python-workflow-submitted-event

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[pratyush618]

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Full review finished.

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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@sdks/python/taskito/workflows/mixins.py`:
- Around line 94-98: Guard the _emit_event call in _inner.submit_workflow with
the same exception-handling pattern used by submit_sub_workflow, logging
delivery failures while allowing tracker.register_run() and the run-handle
return to proceed unchanged.

In `@sdks/python/tests/workflows/test_workflows_subworkflow.py`:
- Around line 75-87: Update the subworkflow event test around the
WORKFLOW_SUBMITTED listener to use a threading.Event that the callback sets
after appending the payload, then wait for that event after run.wait() and
before filtering or asserting child_events. Preserve the existing event
filtering and assertions, following the synchronization pattern used by the
linear submission-event test.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f99e0469-721d-4cef-b316-1385962cc56d

📥 Commits

Reviewing files that changed from the base of the PR and between 6ada5b0 and eb47e8d.

📒 Files selected for processing (5)

• docs/content/docs/python/guides/extensibility/events-webhooks.mdx
• sdks/python/taskito/workflows/mixins.py
• sdks/python/taskito/workflows/tracker/sub_workflows.py
• sdks/python/tests/workflows/test_workflows_linear.py
• sdks/python/tests/workflows/test_workflows_subworkflow.py