Add bounded dynamic workflow orchestration

[Copilot]

Rig lacked deterministic, resource-bounded primitives for coordinating typed agents. This introduces the core dynamic workflow API while preserving existing agent typing and engine independence.

• Workflow API

  • Add workflow() and runWorkflow() via rig/workflow and root exports.
  • Provide typed input, metadata, phases, logs, cancellation, and structured events.

• Orchestration

  • Add typed call and call.text.
  • Add ordered pipeline, parallel, and bounded until primitives.
  • Return null for agent failures while propagating workflow programming errors.

• Resource controls

  • Enforce shared concurrency, total-agent, and wall-clock limits.
  • Abort in-flight work when a run fails.
  • Emit advisory warnings for large runs.

• Documentation

  • Add a focused dynamic-workflow reference and README example.

const audit = workflow({
  meta: { name: "audit", description: "Inspect files", phases: ["Audit"] },
  input: s.object({ files: s.array(s.string) }),
  body: ({ input, call, phase, pipeline }) => {
    phase("Audit");
    return pipeline(input.files, (file) =>
      call(inspect, file, { label: file }));
  },
});

await runWorkflow(audit, {
  args: { files: ["src/a.ts", "src/b.ts"] },
  limits: { concurrency: 8, maxAgents: 100 },
});

• Fixes dynamics #246

[pelikhan]

@copilot merge rig/workflow into rig . single file, single module.

[Copilot]

@copilot merge rig/workflow into rig . single file, single module.

Implemented in cedfc6d: workflow APIs and implementation now live directly in skills/rig/rig.ts; the rig/workflow subpath and standalone module were removed, with tests and docs updated to import from rig.