fix(erxes): document executor graphql concurrency limits

[darjss]

Why

Buyanaa's agent hit Executor HTTP 500 from parallel GraphQL storms and wasted steps on page/perPage pagination. PR #27 fixed empty tool output; this PR adds erxes guardrails with runtime enforcement.

Scope

• packages/workshop-shared/src/erxes-executor-guidance.ts — single source for pagination, concurrency, discovery budget, instance instructions
• packages/workshop-backend/src/overseer.ts — per-chat Executor MCP semaphore (max 5 in-flight)
• packages/workshop-backend/src/agent.ts — executorDescribe capped at 3/turn; tool descriptions from shared guidance
• scripts/deploy-instance.ts — injects INSTANCE_INSTRUCTIONS env var from shared text
• packages/gatekeeper-erxes/src/erxes.ts — EXECUTOR_TYPES from shared guidance

Verification

• bunx vitest run __tests__/executor-tools.test.ts (includes semaphore test)

Test plan

• Deploy sets INSTANCE_INSTRUCTIONS on backend worker
• Parallel executor calls queue instead of overloading host
• 4th executorDescribe in one turn returns limit message

Summary by Sourcery

Add end-to-end erxes Executor guidance and concurrency guardrails to prevent overloaded GraphQL sessions and improve reliable pagination.

New Features:

• Add shared erxes Executor guidance covering cursor pagination, filter formatting, tool discovery, and safe GraphQL concurrency.
• Provide default deploy-time erxes agent instructions with admin-configured instructions taking precedence.

Bug Fixes:

• Prevent overloaded Executor sessions by limiting concurrent MCP calls per chat and discouraging parallel pagination scans.
• Limit executorDescribe usage per turn to reduce unnecessary catalog calls before execution.

Enhancements:

• Centralize erxes Executor limits and guidance across agent prompts, generated executor types, runtime controls, and deployment configuration.

Deployment:

• Inject default erxes agent instructions into deployed backend workers through INSTANCE_INSTRUCTIONS.

Documentation:

• Document erxes Executor workflows, pagination requirements, concurrency guardrails, and gadget scheduling guidance.

Tests:

• Add coverage verifying that the Executor MCP semaphore caps in-flight calls.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the prompt-only Executor documentation to prevent GraphQL page-fetch overload by prescribing bounded concurrency, sequential paging, totalCount-first queries, and partial-result handling.

File-Level Changes

Change	Details	Files
Document GraphQL paging and concurrency guardrails in the generated Executor type guidance.	Limit GraphQL tool calls to five concurrent requests and prefer sequential page fetching. Recommend fetching totalCount first, avoiding large parallel Promise.all scans, and returning partial results on failure.	packages/gatekeeper-erxes/src/erxes.ts

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Sourcery assessment

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