perf(ci): strip debug symbols from builds

Add -ldflags="-s -w" to go build commands in both build and release
workflows. This removes the symbol table and DWARF debug information,
reducing binary sizes by ~30%:

- dtvem: ~10.9MB → ~7.5MB
- dtvem-shim: ~10.3MB → ~7.2MB

Fixes #72

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

Author: CalvinAllen

.github/workflows/build.yml

@@ -140,15 +140,15 @@ jobs:
 
     - name: Build main CLI
       run: |
-        go build -v -o dist/dtvem${{ matrix.goos == 'windows' && '.exe' || '' }} ./src
+        go build -v -ldflags="-s -w" -o dist/dtvem${{ matrix.goos == 'windows' && '.exe' || '' }} ./src
       shell: bash
       env:
         GOOS: ${{ matrix.goos }}
         GOARCH: ${{ matrix.goarch }}
 
     - name: Build shim executable
       run: |
-        go build -v -o dist/dtvem-shim${{ matrix.goos == 'windows' && '.exe' || '' }} ./src/cmd/shim
+        go build -v -ldflags="-s -w" -o dist/dtvem-shim${{ matrix.goos == 'windows' && '.exe' || '' }} ./src/cmd/shim
       shell: bash
       env:
         GOOS: ${{ matrix.goos }}

.github/workflows/release.yml

@@ -179,15 +179,15 @@ jobs:
 
     - name: Build main CLI
       run: |
-        go build -v -o dist/dtvem${{ matrix.goos == 'windows' && '.exe' || '' }} ./src
+        go build -v -ldflags="-s -w" -o dist/dtvem${{ matrix.goos == 'windows' && '.exe' || '' }} ./src
       shell: bash
       env:
         GOOS: ${{ matrix.goos }}
         GOARCH: ${{ matrix.goarch }}
 
     - name: Build shim executable
       run: |
-        go build -v -o dist/dtvem-shim${{ matrix.goos == 'windows' && '.exe' || '' }} ./src/cmd/shim
+        go build -v -ldflags="-s -w" -o dist/dtvem-shim${{ matrix.goos == 'windows' && '.exe' || '' }} ./src/cmd/shim
       shell: bash
       env:
         GOOS: ${{ matrix.goos }}