chore: standardize contributor docs (DCO/CLA, templates)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,27 @@
+---
+name: Bug report
+about: Report a problem
+title: '[BUG] '
+labels: ['bug']
+assignees: ''
+---
+
+## Describe the bug
+A clear description of what's wrong.
+
+## To reproduce
+Steps to reproduce the behavior:
+1. ...
+
+## Expected behavior
+What you expected to happen.
+
+## Environment
+- Version / commit:
+- OS / runtime:
+
+## Additional context
+Logs, screenshots, or config (redact secrets/tokens).
+
+## Checklist
+- [ ] I searched existing issues to avoid duplicates

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Security report
+    url: https://github.com/AltairaLabs/.github/security/policy
+    about: Please report security vulnerabilities privately, not as a public issue.

.github/ISSUE_TEMPLATE/documentation.md

@@ -0,0 +1,26 @@
+---
+name: Documentation improvement
+about: Suggest improvements to documentation
+title: '[DOCS] '
+labels: ['documentation']
+assignees: ''
+---
+
+## Documentation issue
+
+**Location** (file / section / URL):
+
+**What's wrong, unclear, or missing?**
+
+## Proposed improvement
+
+Describe how the documentation should be improved. Include suggested wording or examples if you have them.
+
+## Contribution
+
+- [ ] I'd like to submit a PR with the fix
+- [ ] I'm reporting it for someone else to fix
+
+## Checklist
+- [ ] I searched existing issues to avoid duplicates
+- [ ] I identified the specific documentation location

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,23 @@
+---
+name: Feature request
+about: Suggest a new feature or improvement
+title: '[FEATURE] '
+labels: ['enhancement']
+assignees: ''
+---
+
+## Feature summary
+A one-line summary of the feature.
+
+## Problem statement
+What problem does this solve? Why is it needed?
+
+## Proposed solution
+Describe the solution you'd like.
+
+## Alternatives considered
+Any alternative solutions or workarounds.
+
+## Checklist
+- [ ] I searched existing issues to avoid duplicates
+- [ ] I provided a concrete use case

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,26 @@
+## Summary
+
+**Type of change**
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation
+- [ ] CI / infrastructure
+- [ ] Refactor / tests
+
+**What & why**
+What does this PR do, and why? Link any related issues.
+
+Fixes #(issue)
+
+## Testing
+- [ ] Tests pass locally
+- [ ] Lint / format checks pass locally
+- [ ] Added or updated tests covering the change
+
+## Checklist
+- [ ] My commits are signed off (`git commit -s`) — the DCO check is enforced
+- [ ] I have signed the CLA (the CLA Assistant bot prompts on your first PR)
+- [ ] I have read the [Contributing Guidelines](./CONTRIBUTING.md) and [Code of Conduct](./CODE_OF_CONDUCT.md)
+- [ ] Documentation updated if behavior changed
+- [ ] PR title follows Conventional Commits

CONTRIBUTING.md

@@ -28,6 +28,16 @@ This adds a "Signed-off-by" line to your commit message:
 Signed-off-by: Your Name <your.email@example.com>
 ```
 
+> **This is enforced.** A required `DCO` check verifies every commit in your pull request carries a matching `Signed-off-by` line. If you forget, fix it with `git commit --amend -s` (single commit) or `git rebase --signoff main` (multiple commits), then force-push.
+
+## Contributor License Agreement (CLA)
+
+Before your first contribution can be merged you must sign our Contributor License Agreement. When you open your first pull request, the **CLA Assistant** bot comments with a link to the CLA; you sign by replying on the PR with:
+
+> I have read the CLA Document and I hereby sign the CLA
+
+You sign **once** — the signature then applies to your future contributions across AltairaLabs repositories. The CLA is a **license grant**, not a copyright assignment: you keep ownership of your contribution and grant AltairaLabs a license to use and relicense it. You can read the full text [here](https://gist.github.com/chaholl/acc8f1f6c38376d00a162351f566b93e).
+
 ## How to Contribute
 
 ### Reporting Bugs