refactor(create-expert): clarify context passing mechanism between delegates

[FL4TLiN3]

Summary

Makes explicit that context is passed via query (not shared state) since Perstack delegates only receive the query - no message history or parent context.

Changes

CREATE_EXPERT_INSTRUCTION:

Added "Context Passing" section:

## Context Passing

Delegates only receive the query - no shared state. Include all needed context inline:

**To property-extractor:**
Include the original user requirements in the query.

**To ecosystem-builder:**
Include extracted properties and original requirements in the query.

**To integration-manager:**
Include ecosystem info (expert names) and properties in the query.

**To report-generator:**
Include all accumulated context: requirements, properties, ecosystem info, and test results.

REPORT_GENERATOR_INSTRUCTION:

Clarified input source:

## Input (provided in your query)

The coordinator passes all context in the query:
- Original requirements: What the user asked for
- Extracted properties: From property-extractor output
- Ecosystem info: Expert names and structure
- Test results: From integration-manager output

This aligns with Perstack's context isolation design documented in docs/understanding-perstack/experts.md.

Closes #382

Test plan

• CI passes
• No behavior changes expected

---

Note

Clarifies context passing across delegates

• In CREATE_EXPERT_INSTRUCTION, adds a "Context Passing" section stating delegates receive only the query (no shared state) and specifying what context to include for property-extractor, ecosystem-builder, integration-manager, and report-generator.
• In REPORT_GENERATOR_INSTRUCTION, updates "Input" to explicitly note all context is provided in the query (requirements, extracted properties, ecosystem info, test results).
• Adds .changeset/refactor-382-context-passing.md to release a patch.

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