Move Ruby to 3.4 and the flake to today's nixpkgs-unstable

.github/workflows/test.yml

@@ -353,7 +353,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@e81a8fa391b11a595c1b7ed84177cc0fe02faf83 # v1.328.0
         with:
-          ruby-version: '3.3'
+          ruby-version: '3.4'
 
       - name: Compile the skill-eval patterns
         run: make check-eval-patterns
@@ -494,7 +494,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@e81a8fa391b11a595c1b7ed84177cc0fe02faf83 # v1.328.0
         with:
-          ruby-version: '3.3'
+          ruby-version: '3.4'
 
       - name: Run skill evals
         env:

.mise.toml

@@ -17,4 +17,4 @@ zizmor = "1.30.0"
 # .github/workflows/test.yml. make check compiles the skill-eval patterns under
 # Ruby's own regex engine, so bin/ci needs the same Ruby CI uses — a different
 # engine would answer a different question.
-ruby = "3.3"
+ruby = "3.4"

CONTRIBUTING.md

@@ -41,7 +41,7 @@ The `go.work` file is gitignored - your local setup won't affect the repo.
 - [bats-core](https://github.com/bats-core/bats-core) for integration tests
 - [golangci-lint](https://golangci-lint.run/) for linting
 - [jq](https://jqlang.github.io/jq/) for CLI surface checks
-- Ruby 3.3 for the skill-eval pattern check, which compiles those patterns
+- Ruby 3.4 for the skill-eval pattern check, which compiles those patterns
   under the same engine the eval runner uses
 
 ## Pull Request Process

flake.nix

@@ -41,7 +41,7 @@
               # Keep in sync with .mise.toml and the ruby/setup-ruby pins in
               # .github/workflows/test.yml: make check compiles the skill-eval
               # patterns under Ruby's own regex engine.
-              ruby_3_3
+              ruby_3_4
               zizmor
             ];
           };