docs: add pencil usage guidelines to core-tools #2162

[Kavleri]

This PR addresses issue #2162. Added recommendations for using Pencil in the early planning stages.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: c92035bc-6c7b-465e-94ea-ea141a8ca236

📥 Commits

Reviewing files that changed from the base of the PR and between 2302d9c and 84a3aa5.

📒 Files selected for processing (1)

• docs/reference/core-tools.md

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📝 Walkthrough

Walkthrough

Documentation added to the core tools reference guide for Pencil integration, specifying that Pencil tooling must be declared before generating the architecture artifact and that .pen files must be explicitly included in the project context file.

Changes

Cohort / File(s)	Summary
Pencil Integration Documentation docs/reference/core-tools.md	New "3rd Party Tools Integration: Pencil" section added with operational sequencing requirements and context enforcement guidelines for Pencil tooling.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related issues

• [DOCS] bmad & pencil #2162: PR addresses the same Pencil documentation guidance and sequencing requirements (Pencil specification order and .pen file context enforcement) referenced in this issue.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding Pencil usage guidelines to core-tools documentation.
Description check	✅ Passed	The description accurately relates to the changeset, explaining that it adds recommendations for using Pencil in early planning stages as addressed in issue #2162.
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

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