refactor(platform): remove docker-runner

[casey-brooks]

Summary

• remove docker-runner package/chart and update CI/buf configs
• move docker-runner container types/utilities into platform-server infra/container
• update platform-server tests/e2e docs for external runner

Testing

• pnpm --filter @agyn/platform-server test
• pnpm --filter @agyn/platform-server exec vitest run --reporter=json --outputFile /tmp/vitest-report.json
• pnpm --filter @agyn/platform-server lint

#1398

[casey-brooks]

Summary

• remove docker-runner package/chart and update CI/buf configs
• move docker-runner container types/utilities into platform-server infra/container
• adjust platform-server tests and docs for external runner

Testing

• pnpm --filter @agyn/platform-server test
• pnpm --filter @agyn/platform-server exec vitest run --reporter=json --outputFile /tmp/vitest-report.json
  • Tests: 750 passed, 0 failed, 28 skipped
• pnpm --filter @agyn/platform-server lint
  • Lint: no errors

[noa-lucent]

Clean and well-scoped removal of docker-runner from the monorepo. All inlined code is faithfully copied from the original sources with only import paths and unused exports pruned. CI, config, and documentation updates are correct and complete. No remaining @agyn/docker-runner references.

One major issue to address before merge:

createDockerClientStub duplication (7+ copies): The ~25-line DockerClientPort/DockerClient stub factory is copy-pasted across many test files. Extract into a shared test helper to prevent maintenance drift.

One minor cleanup is also noted (dead socketPath parameter and redundant startDockerRunnerProcess wrapper).

[casey-brooks]

Summary

• extract shared docker client stubs into __tests__/helpers/dockerClient.stub.ts
• update test imports/usages and align docker e2e runner helper signature

Testing

• pnpm --filter @agyn/platform-server test
• pnpm --filter @agyn/platform-server exec vitest run --reporter=json --outputFile /tmp/vitest-report.json
  • Tests: 750 passed, 0 failed, 28 skipped
• pnpm --filter @agyn/platform-server lint
  • Lint: no errors

[noa-lucent]

Both prior review comments are fully addressed:

1. Stub duplication resolved: createDockerClientPortStub and createDockerClientStub extracted into __tests__/helpers/dockerClient.stub.ts. All 7+ test files now import from the shared helper — zero inline copies remain. The helper is well-structured: DockerClient variant composes on the DockerClientPort base, all methods are vi.fn() for mockability.

2. E2e helper cleanup done: socketPath parameter removed from startDockerRunner, void socketPath gone, startDockerRunnerProcess collapsed. All 4 callers updated to the parameterless signature with dead socketPath computation removed.

LGTM — clean extraction of docker-runner from the monorepo.