Prepare public repository templates and source archives

[tpn]

This PR adds issue and pull request templates and CODEOWNERS entries so contributors have a consistent way to report problems, propose changes, and find reviewers. It also removes archive exclusions so source archives contain the tracked runtime files needed to build and use cuPhoton.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: NVIDIA/cuPhoton/.coderabbit.yaml

Review profile: CHILL

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Run ID: 7aa71c9e-56be-4fa7-bc41-c942a21a78f5

📥 Commits

Reviewing files that changed from the base of the PR and between 201e039 and 4628054.

📒 Files selected for processing (7)

• .gitattributes
• .github/CODEOWNERS
• .github/ISSUE_TEMPLATE/bug.yml
• .github/ISSUE_TEMPLATE/config.yml
• .github/ISSUE_TEMPLATE/feature.yml
• .github/ISSUE_TEMPLATE/task.yml
• .github/PULL_REQUEST_TEMPLATE.md

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📝 Walkthrough

Walkthrough

The PR updates export policy, adds structured issue forms and security-report guidance, assigns repository ownership, and adds pull request review requirements.

Changes

Repository contribution controls

Layer / File(s)	Summary
Export policy .gitattributes	Adds export-policy comments, retains GitLab exclusions, and removes GitHub and script export exclusions.
Issue intake forms .github/ISSUE_TEMPLATE/*	Adds bug, feature, and task forms. Disables blank issues and provides a private security vulnerability submission link.
Contribution review controls .github/CODEOWNERS, .github/PULL_REQUEST_TEMPLATE.md	Adds a repository-wide ownership rule and pull request checks for validation, repository hygiene, security, documentation, and dependency licenses.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 46280

The contribution templates, private security routing, ownership configuration, and export-policy updates are suitable to merge.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
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.

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[melo-gonzo]

LGTM. I pushed 62e81ef restoring the internal export-ignore block (.gitlab, .gitlab-ci.yml, scripts, AGENTS.md, CLAUDE.md, CHANGELOG.md, RELEASING.md) so .gitattributes matches the internal tree and does not conflict on the next promotion. The only intended difference from the previous public file is the removal of the .github lines.

[tpn]

Kept the restored export exclusions and removed only the two broad scripts rules: the MPI rank launcher in #10 is required by the package metadata. The archive check now retains its exact bytes and executable mode, while the other exclusions remain intact.

A second maintainer would help with review coverage. The current rules require independent approval but do not require CODEOWNERS approval, so I’ve left owner selection for a separate maintainership change.

[melo-gonzo]

Re-approving after the rebase onto main: range-diff against 62e81ef is identical, plus Trent's 96ff94d keeping the MPI launcher in archives.

[tpn]

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