fix: remove stale validate-workflow.xml references

[arcaven]

Summary

Remove stale references to validate-workflow.xml which was intentionally removed from the project.

Changes

• Delete handler-validate-workflow.txt (handler for removed task)
• Update checklist.md (remove framework references)
• Update instructions.xml (replace invoke-task with action)
• Update activation-steps.txt (remove from command list)
• Update test/README.md (5 command types, not 6)

Context

Issue #1530 reported that validate-workflow.xml was missing. @alexeyv confirmed the file was intentionally removed. This PR cleans up the remaining stale references to prevent confusion.

Closes #1530

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request removes the validate-workflow handler infrastructure and replaces it with direct in-line validation in the create-story workflow. References to the missing validate-workflow.xml file are eliminated from configuration, documentation, and workflow definitions.

Changes

Cohort / File(s)	Summary
Workflow Definition & Documentation src/bmm/workflows/4-implementation/create-story/checklist.md, src/bmm/workflows/4-implementation/create-story/instructions.xml	Removed explicit references to validate-workflow.xml framework; consolidated workflow steps and converted <invoke-task> for validation into a direct <action>. Updated checklist guidance to describe workflow-driven process generically.
Handler & Component Configuration src/utility/agent-components/handler-validate-workflow.txt, src/utility/agent-components/activation-steps.txt	Removed entire validate-workflow handler block; reduced EXECUTE_STEP attributes from 6 to 5 by removing validate-workflow attribute extraction.
Test Documentation test/README.md	Updated valid menu item command types from six to five, removing validate-workflow.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• fix(bmm): resolve dead references and syntax errors in agents and workflows #1164 — Removes or replaces usages of the unrecognized validate-workflow/validate-create-story handler across multiple files in parallel with this PR.

Suggested reviewers

• bmadcode
• alexeyv
• pbean

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: remove stale validate-workflow.xml references' directly and concisely describes the main change: removing outdated references to an intentionally deleted file.
Description check	✅ Passed	The description clearly explains the purpose (removing stale references), lists the specific files changed, provides context about issue #1530, and explicitly states which issue this closes.
Linked Issues check	✅ Passed	The PR directly addresses issue #1530 by removing all stale references to validate-workflow.xml across five files, matching the issue's request to clean up dangling references if the file was intentionally removed.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to removing stale validate-workflow.xml references: deleting the handler, updating workflow files, removing from command lists, and updating documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[arcaven]

Closing this PR — we jumped the gun on two fronts:

1. No maintainer confirmation on issue #1530
Issue #1530 has zero comments. We assumed the validate-workflow.xml removal was intentional based on issue #1541's closure comment, but #1541 was about a different issue (schema fields, not the missing task file). We should wait for @bmadcode or @alexeyv to confirm whether the file should be restored or references removed.

2. Scope overlap with PR #1567
PR #1567 (workflow.md migration) is the official effort to clean up legacy workflow.xml/yaml references. Our changes to checklist.md and instructions.xml overlap with that migration and could create merge conflicts. Those files should be handled as part of the broader migration, not in a separate cleanup PR.

Will wait for maintainer guidance on #1530 before resubmitting a narrower fix (if needed).