Budget-Aware Task Orchestration

[nathanwhitbot]

Summary

• Adds optional task budget fields for worker-turn and replan-turn limits across task creation, MCP schema, and web API types.
• Normalizes budget input into task metadata and includes budget context in scheduler and replanner prompt payloads.
• Adds service-side budget guards before initial worker launch and dynamic replanning, including budget status reporting and preserving existing PR/external wait behavior.

Validation

• go test ./internal/orchestrator ./internal/httpapi ./internal/core

[nathanwhit]

Reviewed the budget-aware orchestration change. Budget metadata is normalized from API and MCP inputs, included in initial and replan prompts, and enforced before initial and dynamic worker scheduling. The exhausted-budget path preserves a usable candidate when one exists and asks for steering when it does not. CI is green.