docs(project): establish research and governance baseline (#1)

.github/pull_request_template.md

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+## Summary
+
+Describe the problem and the outcome of this change.
+
+## Verification
+
+List automated tests, manual checks, environments, and meaningful measurements.
+
+## Research And Decisions
+
+Link the relevant requirement, research note, issue, and ADR, or explain why none is needed.
+
+## Checklist
+
+- [ ] The branch contains one coherent change and no unrelated churn.
+- [ ] Tests and repository hygiene checks pass.
+- [ ] Security, privacy, compatibility, and licensing effects were considered.
+- [ ] Requirements, operational docs, ADRs, project memory, and status were updated where their facts changed.
+- [ ] Stale or conflicting memory and documentation were removed rather than preserved as a diary.
+- [ ] No credentials, personal data, machine-specific paths, or required untracked artifacts are included.