Allow agent Docker image to run make commands

[issuetopr-dev]

Summary

• Installs GNU make in the agent base Docker image so agents can run make targets inside their containers.
• Updates documentation to include make in the list of preinstalled tools.

Why
Agents that execute workflows in containers sometimes need to invoke Makefile targets (e.g., building native deps, project-specific build/test flows). The current base image did not include make.

Changes

• docker/agent-base/Dockerfile
  • Add make to the apt packages and verify installation with make --version.
• docker/README.md
  • Document that the agent image includes make.

Verification

• Linting: Ran pnpm run check:all (ESLint, Prettier check, TypeScript noEmit) with no errors.
• No application code changed; the change is confined to Dockerfile and docs.

Impact

• New agent base image builds will include make automatically. Existing running containers are unaffected until rebuilt/pulled.

Follow-up

• If you publish your agent base image to GHCR, run ./scripts/build-agent-image.sh to build and push multi-arch images with the updated toolchain.

Closes #1464

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