feat(dev-workflow): stream live progress in run.ts (#234)

[Neftedollar]

Summary

• switch dev-workflow live execution from blocking run() to streamed progress output
• print task start/complete/error lines with durations and cost tracking
• add dedicated unit tests for progress rendering/stream draining
• update dev-workflow README status and live-run behavior notes

Validation

• bun run --filter @ageflow/dev-workflow typecheck
• bun run --filter @ageflow/dev-workflow test
• bun run --filter @ageflow/dev-workflow lint

Closes #234

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Include halted-task cost in spent budget tracking

state.spentUsd is updated only in the task:complete branch, but this workflow sets budget.onExceed to "halt", and the executor checks budget after adding task cost but before emitting task:complete. When a task pushes spend over cap, execution goes through task:error without a matching task:complete, so the progress UI under-reports actual spend and can skip the intended 80% warning on that failure path.

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