feat(k6): add @effectionx/k6 package

.gitignore

@@ -27,6 +27,7 @@ dist/
 !process/test/fixtures/dump-args.js
 !process/test/fixtures/hello-world.js
 !process/test/fixtures/hello-world-failed.js
+!k6/build.js
 
 # turborepo cache
 .turbo
@@ -36,10 +37,10 @@ dist/
 
 # Test temp directories
 **/test-tmp/
+k6/test-results/
 
 # pnpm config (created by test-matrix runner)
 .npmrc
 
 # Agent shell directories
 .agent-shell/
-

k6/.dockerignore

@@ -0,0 +1,4 @@
+node_modules
+test-results
+*.log
+.git

k6/.gitignore

@@ -0,0 +1 @@
+test-results/

k6/Dockerfile

@@ -0,0 +1,54 @@
+# Dockerfile for K6 with Effection support
+#
+# This builds a custom K6 binary that includes the Sobek yield-in-finally fix
+# required for Effection's structured concurrency cleanup semantics.
+#
+# Prerequisites:
+#   Run `node build.js` in the k6 directory to build the JS bundles first.
+#
+# Multi-stage build:
+#   1. Build custom K6 with patched Sobek
+#   2. Alpine runtime with custom K6 + pre-built JS bundles
+
+# =============================================================================
+# Stage 1: Build custom K6 with Sobek fix
+# =============================================================================
+FROM golang:1.24-alpine AS k6-builder
+
+WORKDIR /build
+
+# Install git for cloning
+RUN apk add --no-cache git
+
+# Clone K6 source
+RUN git clone --depth 1 https://github.com/grafana/k6.git .
+
+# Add replace directive to use our fixed Sobek fork
+# This fixes: https://github.com/grafana/sobek/issues/114
+RUN echo 'replace github.com/grafana/sobek => github.com/taras/sobek v0.0.0-20260215012414-013550b38489' >> go.mod
+
+# Build K6 with the patched Sobek
+RUN go mod tidy && go build -mod=mod -o k6 ./
+
+# =============================================================================
+# Stage 2: Runtime image with custom K6
+# =============================================================================
+FROM alpine:latest
+
+# Install ca-certificates for HTTPS requests
+RUN apk add --no-cache ca-certificates
+
+# Copy custom K6 binary
+COPY --from=k6-builder /build/k6 /usr/local/bin/k6
+
+# Copy pre-built bundles (must run `node build.js` first)
+COPY dist /tests
+
+# Set working directory
+WORKDIR /tests
+
+# Default entrypoint
+ENTRYPOINT ["k6", "run"]
+
+# Default command runs conformance tests
+CMD ["conformance-bundle.js"]