ci: migrate to reusable workflows from plexusone/.github

Replace inline CI/Lint/SAST workflows with reusable workflows:
- ci.yaml → go-ci.yaml (uses plexusone/.github/.github/workflows/go-ci.yaml)
- lint.yaml → go-lint.yaml (uses plexusone/.github/.github/workflows/go-lint.yaml)
- sast_codeql.yaml → go-sast-codeql.yaml (uses plexusone/.github/.github/workflows/go-sast-codeql.yaml)

Benefits:
- Centralized workflow maintenance
- Consistent CI across plexusone repositories
- Path-based triggers to avoid unnecessary runs

Also updates LICENSE copyright year to 2025-2026.

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

Author: grokify

.github/workflows/ci.yaml

@@ -0,0 +1,25 @@
+name: Go CI
+permissions:
+  contents: read
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/go-ci.yaml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/go-ci.yaml'
+  workflow_dispatch:
+
+jobs:
+  ci:
+    uses: plexusone/.github/.github/workflows/go-ci.yaml@main

.github/workflows/go-ci.yaml

@@ -0,0 +1,27 @@
+name: Go Lint
+permissions:
+  contents: read
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.golangci.yml'
+      - '.github/workflows/go-lint.yaml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.golangci.yml'
+      - '.github/workflows/go-lint.yaml'
+  workflow_dispatch:
+
+jobs:
+  lint:
+    uses: plexusone/.github/.github/workflows/go-lint.yaml@main

.github/workflows/go-lint.yaml

@@ -0,0 +1,29 @@
+name: Go SAST (CodeQL)
+permissions:
+  actions: read
+  contents: read
+  security-events: write
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/go-sast-codeql.yaml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/go-sast-codeql.yaml'
+  schedule:
+    - cron: '0 6 * * 1'
+  workflow_dispatch:
+
+jobs:
+  sast:
+    uses: plexusone/.github/.github/workflows/go-sast-codeql.yaml@main