chore: add build and release config files

- .core/build.yaml - cross-platform build configuration
- .core/release.yaml - release workflow configuration

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.core/build.yaml

@@ -0,0 +1,32 @@
+# Core CLI build configuration
+# Used by: core build
+
+version: 1
+
+project:
+  name: core
+  description: Host UK Core CLI
+  main: "."
+  binary: core
+
+build:
+  cgo: false
+  flags:
+    - -trimpath
+  ldflags:
+    - -s
+    - -w
+    - -X main.Version={{.Version}}
+  env: []
+
+targets:
+  - os: linux
+    arch: amd64
+  - os: linux
+    arch: arm64
+  - os: darwin
+    arch: amd64
+  - os: darwin
+    arch: arm64
+  - os: windows
+    arch: amd64

.core/release.yaml

@@ -0,0 +1,39 @@
+# Core CLI release configuration
+# Used by: core release
+
+version: 1
+
+project:
+  name: core
+  repository: host-uk/core
+
+build:
+  targets:
+    - os: linux
+      arch: amd64
+    - os: linux
+      arch: arm64
+    - os: darwin
+      arch: amd64
+    - os: darwin
+      arch: arm64
+    - os: windows
+      arch: amd64
+
+publishers:
+  - type: github
+    prerelease: false
+    draft: false
+
+changelog:
+  include:
+    - feat
+    - fix
+    - perf
+    - refactor
+  exclude:
+    - chore
+    - docs
+    - style
+    - test
+    - ci