fix: correct relative path to prd-purpose.md in step-11-polish

[arcaven]

Summary

The purposeFile reference in step-11-polish.md uses ./data/prd-purpose.md but the data/ directory is a sibling of the steps-c/ directory, not inside it. The correct relative path from steps-c/ is ../data/prd-purpose.md.

File: src/bmm/workflows/2-plan-workflows/create-prd/steps-c/step-11-polish.md (line 8)

- purposeFile: './data/prd-purpose.md'
+ purposeFile: '../data/prd-purpose.md'

Directory structure:

create-prd/
├── data/
│   └── prd-purpose.md    ← target file
├── steps-c/
│   └── step-11-polish.md ← referencing file (./data/ is wrong, ../data/ is correct)
└── ...

Fixes #1495

🔍 This broken reference was detected by the cross-file reference validator proposed in #1494. With that validator in CI, this class of bug would be caught automatically at PR time.

Test plan

• npm test passes (all linting, schema validation, formatting checks)
• Verified ../data/prd-purpose.md resolves to the correct file

[coderabbitai]

📝 Walkthrough

Walkthrough

A relative path reference in a workflow markdown file is corrected from ./data/prd-purpose.md to ../data/prd-purpose.md to point to the correct sibling directory instead of a non-existent child directory.

Changes

Cohort / File(s)	Summary
Relative Path Fix src/bmm/workflows/2-plan-workflows/create-prd/steps-c/step-11-polish.md	Corrected relative path for purposeFile reference from ./data/prd-purpose.md to ../data/prd-purpose.md to properly point to the data directory at the correct hierarchy level.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related issues

• fix: broken relative path in create-prd step-e-04-complete.md #1496: Related issue that addresses similar relative path corrections in the create-prd workflow structure where references need to navigate to sibling directories rather than child directories.

Suggested reviewers

• alexeyv
• pbean
• muratkeremozcan

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: fixing an incorrect relative path in step-11-polish.md.
Description check	✅ Passed	The description is directly related to the changeset, explaining the path correction, directory structure, and verification steps.
Linked Issues check	✅ Passed	The pull request directly addresses issue #1495 by implementing the exact fix specified: changing './data/prd-purpose.md' to '../data/prd-purpose.md'.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to correcting the single relative path reference specified in issue #1495 with no extraneous modifications.
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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