ci(windows): checkout and run tests entirely on RAM disk

Move everything to RAM disk for maximum I/O speedup:
- Setup RAM disk BEFORE checkout
- Checkout source code directly to R:\work
- Set TEMP/TMP/GOCACHE/GOMODCACHE at job level
- Run build and tests from RAM disk working directory

This ensures ALL file operations happen on RAM, not just temp files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.github/workflows/ci.yml

@@ -55,17 +55,26 @@ jobs:
     name: Test (Windows - cmd)
     runs-on: windows-latest
     continue-on-error: true  # Windows filesystem is slow; don't block PRs
+    env:
+      # Use RAM disk for all I/O - provides ~1750x faster IOPS than C: drive
+      TEMP: R:\tmp
+      TMP: R:\tmp
+      GOCACHE: R:\go-cache
+      GOMODCACHE: R:\go-mod
     steps:
-      - uses: actions/checkout@v6
-
-      # RAM disk provides ~1750x faster IOPS than Windows C: drive
-      # This dramatically speeds up SQLite tests and temp file operations
       - name: Setup RAM Disk
         uses: chad-golden/setup-ramdisk@v1.0.1
         with:
           size-in-mb: 4096
           drive-letter: 'R'
 
+      - name: Prepare RAM disk directories
+        run: New-Item -ItemType Directory -Force -Path R:\tmp, R:\go-cache, R:\go-mod, R:\work
+
+      - uses: actions/checkout@v6
+        with:
+          path: R:\work
+
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
@@ -76,35 +85,36 @@ jobs:
           git config --global user.name "CI Bot"
           git config --global user.email "ci@beads.test"
 
-      - name: Build
-        run: go build -v ./cmd/bd
-
-      - name: Test cmd package
-        env:
-          TMPDIR: R:\tmp
-          TEMP: R:\tmp
-          TMP: R:\tmp
-          GOCACHE: R:\go-cache
-          GOMODCACHE: R:\go-mod
+      - name: Build and Test cmd package
+        working-directory: R:\work
         run: |
-          New-Item -ItemType Directory -Force -Path R:\tmp, R:\go-cache, R:\go-mod
+          go build -v ./cmd/bd
           go test -v -short -timeout=30m -parallel=4 ./cmd/...
 
   test-windows-internal:
     name: Test (Windows - internal)
     runs-on: windows-latest
     continue-on-error: true  # Windows filesystem is slow; don't block PRs
+    env:
+      # Use RAM disk for all I/O - provides ~1750x faster IOPS than C: drive
+      TEMP: R:\tmp
+      TMP: R:\tmp
+      GOCACHE: R:\go-cache
+      GOMODCACHE: R:\go-mod
     steps:
-      - uses: actions/checkout@v6
-
-      # RAM disk provides ~1750x faster IOPS than Windows C: drive
-      # This dramatically speeds up SQLite tests and temp file operations
       - name: Setup RAM Disk
         uses: chad-golden/setup-ramdisk@v1.0.1
         with:
           size-in-mb: 4096
           drive-letter: 'R'
 
+      - name: Prepare RAM disk directories
+        run: New-Item -ItemType Directory -Force -Path R:\tmp, R:\go-cache, R:\go-mod, R:\work
+
+      - uses: actions/checkout@v6
+        with:
+          path: R:\work
+
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
@@ -116,15 +126,8 @@ jobs:
           git config --global user.email "ci@beads.test"
 
       - name: Test internal packages
-        env:
-          TMPDIR: R:\tmp
-          TEMP: R:\tmp
-          TMP: R:\tmp
-          GOCACHE: R:\go-cache
-          GOMODCACHE: R:\go-mod
-        run: |
-          New-Item -ItemType Directory -Force -Path R:\tmp, R:\go-cache, R:\go-mod
-          go test -v -short -timeout=30m -parallel=4 ./internal/...
+        working-directory: R:\work
+        run: go test -v -short -timeout=30m -parallel=4 ./internal/...
 
   lint:
     name: Lint