chore: adopt engineering standard v1.0.0

Adopt the org engineering standard (its-consulting/standards @ v1.0.0).

Adds baseline governance/CI/policy files rendered from the standard's
templates and pins .standards-version=1.0.0. Vendored OPA/Rego policies
under .standards/policies/ so CI runs the gate locally (no cross-repo dep).
Placeholders ({{ORG}}/{{REPO}}/{{OWNER_HANDLE}}/{{MAINTAINER_EMAIL}}) filled in.
Existing files that differ were left untouched by the adopter.

Automated rollout. Files created: 15.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,37 @@
+---
+name: Feature request
+about: Propose new functionality or a change to existing behaviour
+title: "feat: <short summary>"
+labels: [enhancement, triage]
+assignees: []
+---
+
+<!--
+Rendered into <repo>/.github/ISSUE_TEMPLATE/ by adopt-standard.sh.
+If this proposes a change to a rule, contract, or default, expect to record an ADR
+(docs/adr/NNNN-*.md) before it is implemented — see CONTRIBUTING.md.
+-->
+
+## Problem / motivation
+
+<!-- What problem does this solve? Who feels the pain, and when? -->
+
+## Proposed solution
+
+<!-- What you'd like to happen. Be concrete. -->
+
+## Alternatives considered
+
+<!-- Other approaches and why they are worse/better. -->
+
+## Scope & impact
+
+- [ ] Backward compatible (`MINOR`)
+- [ ] Breaking — consumers must act (`MAJOR`)
+- [ ] Needs an **ADR** (decision about a rule/contract/default)
+- [ ] Needs an **SOP** and/or **Policy** change
+- [ ] Affects CI / deploy / secrets handling
+
+## Additional context
+
+<!-- Links, prior art, related issues/ADRs. -->