refactor(create-expert): convert procedural instructions to declarative domain knowledge

[FL4TLiN3]

Summary

Converts procedural step-by-step instructions in create-expert's internal experts to declarative domain knowledge, aligning with Best Practice #2 "Trust the LLM, Define Domain Knowledge".

Changes

• CREATE_EXPERT_INSTRUCTION: Replace numbered workflow steps with delegate descriptions and context passing guidance
• INTEGRATION_MANAGER_INSTRUCTION: Replace numbered workflow with role description and responsibilities
• EXPERT_TESTER_INSTRUCTION: Replace step-by-step testing process with domain knowledge sections

Before (procedural)

## Workflow
1. **Extract Properties**: Delegate to `property-extractor`...
2. **Build Expert Ecosystem**: Delegate to `ecosystem-builder`...
3. **Integration Testing**: Delegate to `integration-manager`...

After (declarative)

## Delegates
- `property-extractor`: Analyzes requirements and identifies testable properties
- `ecosystem-builder`: Creates the Expert ecosystem (main, demo, setup, doctor)
- `integration-manager`: Coordinates all testing and quality assessment

## Context Passing
Include relevant context when delegating...

Closes #376

Test plan

• CI passes
• No behavior changes expected (instructions refactored, not logic)

---

Note

Refactors instruction text to be declarative and policy-driven across the create-expert ecosystem.

• Updates CREATE_EXPERT_INSTRUCTION with delegate roles, context passing, quality standards, and architecture
• Revises INTEGRATION_MANAGER_INSTRUCTION to describe parallel delegation, trade-off analysis, integration verification, and scoring with a defined report format
• Reworks EXPERT_TESTER_INSTRUCTION to emphasize black-box exec testing, parallel test execution, stage-specific domain knowledge, and clear evaluation criteria
• Keeps FUNCTIONAL_MANAGER_INSTRUCTION and USABILITY_MANAGER_INSTRUCTION aligned with declarative testing categories and outputs
• Changes limited to instruction strings in apps/create-expert/src/lib/create-expert-toml.ts plus a patch changeset; no runtime or logic modifications

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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