feat(agents): add contribute-to-bitplatform agent skill (#12338)

[yasmoradi]

Summary

Adds a new GitHub Copilot agent skill that guides contributors through the full bitfoundation/bitplatform contribution workflow inside VS Code.

Changes

• Added .github/agents/contribute-to-bitplatform.agent.md with YAML front-matter, step-by-step contribution instructions, label reference table, branch naming convention, and PR template enforcing This closes #<issue-number>

Related Issue

This closes #12338

Summary by CodeRabbit

• Documentation
  • Added a comprehensive contribution workflow guide, including prerequisites, step-by-step instructions, branch naming conventions, and pull request guidelines for contributors.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

This PR introduces a new GitHub agent guide that provides structured, step-by-step contributor workflow documentation. The guide walks contributors through fork synchronization, focused issue creation with proper labeling, branch creation from upstream, and pull request submission with issue references and conventional commit formatting.

Changes

Contribution Workflow Agent

Layer / File(s)	Summary
Contribution workflow agent guide .github/agents/contribute-to-bitplatform.agent.md	New agent guide defines prerequisites (fork/remote verification), five ordered contribution steps (sync develop, create issue with labels, create branch, implement change, open PR), a label-selection table, branch naming conventions (<issue-id>-<short-description>), and PR template with conventional commit format and This closes #<issue-number> closure reference.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A rabbit hops through the garden of code,
With paths now so clear on the contribution road.
Fork, branch, and commit in the order of grace,
No more muddy hoofprints all over the place! 🌿

🚥 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 'feat(agents): add contribute-to-bitplatform agent skill' accurately describes the main change: adding a new agent skill documentation file to guide contribution workflow.
Linked Issues check	✅ Passed	The PR fully addresses issue #12338 by creating the documented agent skill with all required workflow steps: fork syncing, issue creation with labels, branch naming from upstream/develop, and PR template with 'This closes #' convention.
Out of Scope Changes check	✅ Passed	The PR contains only the targeted documentation file (.github/agents/contribute-to-bitplatform.agent.md) directly addressing issue #12338 requirements with no extraneous changes.
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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