Release opencode-ruby 0.0.1.alpha6

Subscribe before prompt, reconnect without replay, deterministic transport tests, trusted publishing, and repaired packaged-gem CI.

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         ruby: ["3.2", "3.3", "3.4"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Ruby ${{ matrix.ruby }}
         uses: ruby/setup-ruby@v1
@@ -30,5 +30,5 @@ jobs:
 
       - name: Verify gem loads after install
         run: |
-          gem install --local opencode-ruby-*.gem
+          gem install opencode-ruby-*.gem --no-document
           ruby -ropencode-ruby -e 'puts Opencode::VERSION'