docs: apply fleet-template (16-artifact scaffold)

Adds missing standard artifacts:
- README.md (if missing)
- AGENTS.md (AI agent contract)
- PLAN.md (current sprint)
- STATUS.md (where we are)
- DEVELOPMENT.md (dev workflow)
- DEPLOYMENT.md (deploy procedure)
- TESTING.md (test strategy)
- DECISIONS.md (ADR index + templates)
- .github/CODEOWNERS
- .github/workflows/ci.yml

Preserves all existing artifacts.

Refs: RugMunchMedia/fleet-template

.github/pull_request_template.md

@@ -0,0 +1,33 @@
+## Description
+
+<!-- What does this PR do? Why is it needed? -->
+
+## Type of Change
+
+- [ ] feat: new feature
+- [ ] fix: bug fix
+- [ ] docs: documentation
+- [ ] refactor: code restructuring
+- [ ] test: test addition/fix
+- [ ] chore: maintenance
+- [ ] security: security fix
+
+## How Has This Been Tested?
+
+<!-- Describe your testing approach -->
+
+## Checklist
+
+- [ ] My code follows the project style (ruff/mypy pass)
+- [ ] I have added tests that prove my fix/feature works
+- [ ] All existing tests pass (`make test`)
+- [ ] No new lint warnings (`make lint`)
+- [ ] No security issues (`make security`)
+- [ ] I have read the pre-commit hallucination check output
+- [ ] This PR has a conventional commit message
+
+## Related Issues
+
+<!-- Fixes #..., Closes #... -->
+
+## Screenshots (if applicable)