ci: Set fail-fast to false for all matrix jobs

Updates the 'test_linux', 'test_mac', and 'test_windows' jobs in 'ci.yml' to explicitly set 'strategy.fail-fast' to 'false'.

This ensures that all matrix variations for each job will run to completion, even if one of the variations fails. This provides a more complete picture of test status across all supported Node.js versions.

.github/workflows/ci.yml

@@ -26,6 +26,7 @@ jobs:
     name: 'Test (Linux)'
     runs-on: 'gemini-cli-ubuntu-16-core'
     strategy:
+      fail-fast: false
       matrix:
         node-version:
           - '20.x'
@@ -78,6 +79,7 @@ jobs:
     runs-on: '${{ matrix.os }}'
     continue-on-error: true
     strategy:
+      fail-fast: false
       matrix:
         os:
           - 'macos-latest'
@@ -156,6 +158,8 @@ jobs:
     name: 'Slow Test - Win'
     runs-on: 'gemini-cli-windows-16-core'
     continue-on-error: true
+    strategy:
+      fail-fast: false
 
     steps:
       - name: 'Checkout'