chore: add CODEOWNERS and PR template

[ulises-jeremias]

Adds missing CODEOWNERS (* @ulises-jeremias) and PR template for consistent review routing.

• CODEOWNERS ensures reviews are requested automatically
• PR template includes PKGBUILD validation checklist (makepkg --printsrcinfo / shellcheck / namcap)

Part of repo hardening (Phase 3).

Summary by CodeRabbit

• Documentation

  • Added a pull request template with structured sections for descriptions, change types, testing steps, and contributor checklists.
  • Included validation guidance specific to PKGBUILD changes.

• Chores

  • Updated repository ownership configuration to assign a code owner for repository-wide changes.

[coderabbitai]

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Review configuration:

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 56cb1aa9-041b-4b07-b89d-32108fc99fa5

📥 Commits

Reviewing files that changed from the base of the PR and between dd45b38 and 3a2233e.

📒 Files selected for processing (1)

• .github/dependabot.yml

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f2d8e30d-c3ff-4bd8-8dbc-266e2a1c2522

📥 Commits

Reviewing files that changed from the base of the PR and between f7914e6 and dd45b38.

📒 Files selected for processing (2)

• .github/CODEOWNERS
• .github/pull_request_template.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The repository now assigns a global code owner and provides a pull request template with contribution and validation sections.

Changes

Repository governance

Layer / File(s)	Summary
Ownership and pull request workflow .github/CODEOWNERS, .github/pull_request_template.md	The repository assigns a global code owner. The pull request template defines description, change classification, testing, self-review, and optional PKGBUILD validation sections.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to dd45b

This change only adds CODEOWNERS routing and a pull request checklist; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 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 two main changes: adding a CODEOWNERS file and a pull request template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-codeowners-pr-template

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