156e7ca2df
Formalise the PR-flow conventions while we install the PR-flow itself. .gitea/pull_request_template.md auto-populates the PR body in Gitea with five sections: Summary / Motivation / Implementation notes / Verification (with CI-gate checkboxes + ADR/diagram update flags) / Related. Sections can be left blank when irrelevant; the template guides without adding ceremony. Header HTML comment reminds the contributor of the PR title format and links to the full convention. docs/development.md §5 (Conventional commit cycle) gains a 'PR conventions' subsection that: - explains why the PR title format matters (squash-merge subject on main, validated by commitlint in the CI 'commits' job) - separates feature-branch commit hygiene (exploratory OK) from PR title hygiene (must conform) - documents the type vocabulary (feat/fix/docs/style/refactor/perf/ test/build/ci/chore/revert) - proposes an optional scope vocabulary (apps, libs, cross-cutting domains like decisions/docs/ci/deps) - describes the body template No new ADR. The PR title format is derived from ADR-0007 (Conventional Commits at the commit-msg layer) plus ADR-0015 (squash-merge means PR title becomes the commit subject on main). The body template is tactical guidance, not architectural.