ci: retire the dead .github lane, fold its gate into hanzo.yml

.hanzo/workflows already exists, and the forge resolves the first workflow
directory that exists rather than the union — so these three have run nothing
here since it landed. Removing them makes that visible in the tree.

The sanity check's real content is now in hanzo.yml: `go vet` and the race
detector join the build and test that were already there. Lost with it:
golangci-lint and the Codecov upload, which reports to a SaaS bound to GitHub.

close-inactive-issues.yml drops as GitHub issue automation. integration-tests.yml
drops because it drives the live OpenAI API and no key is declared on this repo
or the hanzoai org, so it could only ever have failed; API-contract coverage is
lost until one exists.

.github/workflows/close-inactive-issues.yml

@@ -1,23 +0,0 @@
-name: Close inactive issues
-on:
-  schedule:
-    - cron: "30 1 * * *"
-
-jobs:
-  close-issues:
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
-    steps:
-      - uses: actions/stale@v9
-        with:
-          days-before-issue-stale: 30
-          days-before-issue-close: 14
-          stale-issue-label: "stale"
-          exempt-issue-labels: 'bug,enhancement'
-          stale-issue-message: "This issue is stale because it has been open for 30 days with no activity."
-          close-issue-message: "This issue was closed because it has been inactive for 14 days since being marked as stale."
-          days-before-pr-stale: -1
-          days-before-pr-close: -1
-          repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/integration-tests.yml

@@ -1,21 +0,0 @@
-name: Integration tests
-
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  integration_tests:
-    name: Run integration tests
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    - name: Setup Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: '1.21'
-    - name: Run integration tests
-      env:
-        OPENAI_TOKEN: ${{ secrets.OPENAI_TOKEN }}
-      run: go test -v -tags=integration ./api_integration_test.go

.github/workflows/pr.yml

@@ -1,27 +0,0 @@
-name: Sanity check
-
-on:
-  - push
-  - pull_request
-
-jobs:
-  prcheck:
-    name: Sanity check
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    - name: Setup Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: '1.24'
-    - name: Run vet
-      run: |
-        go vet .
-    - name: Run golangci-lint
-      uses: golangci/golangci-lint-action@v6
-      with:
-        version: v1.64.5
-    - name: Run tests
-      run: go test -race -covermode=atomic -coverprofile=coverage.out -v .
-    - name: Upload coverage reports to Codecov
-      uses: codecov/codecov-action@v4

hanzo.yml

@@ -1,3 +1,10 @@
+# The race detector and `go vet` come from the sanity check this replaces; the
+# integration suite it sat beside drives the live OpenAI API and has no key
+# declared here, so it belongs to a harness, not a push gate.
 test:
   - name: build
-    run: go build ./... && go test ./...
+    run: |
+      set -euo pipefail
+      go build ./...
+      go vet ./...
+      go test -race ./...