chore(platform): initialize GitOps workflow

.platform/initialized.md

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+# Platform Initialization
+
+| Field | Value |
+|-------|-------|
+| Component | `tmpl-test-go` |
+| Repository | `validate/tmpl-test-go` |
+| Scaffolded | 2026-03-24 |
+| Branch model | `main` (protected) ← `dev` (integration) ← `feature/*` |
+
+## Continuous Modernization
+
+This repository is configured for platform-managed continuous modernization.
+The platform can open PRs against `dev` at any time to:
+
+- Apply security patches and dependency updates
+- Enforce architecture conformance patterns
+- Promote environment configuration changes
+
+All platform PRs target `dev` first.
+Promotion to `main` requires approval via the Backstage deployment gate.