Docs: Add missing BloodCell import to circulatory quick start

[kluth]

Problem

The Circulatory System quick start example uses BloodCell but doesn't show it in the import statement.

Affected Files

Documentation: /home/matthias/projects/synapse/docs/systems/circulatory/README.md (lines 382-413)

Issue Details

Severity: HIGH
Impact: Copy-paste code will not compile

Current (Incomplete) Import

import { Heart, PublishSubscribe, RequestResponse } from '@synapse-framework/core';

Code Uses BloodCell Without Importing

const cell = new BloodCell(...);  // Error: BloodCell is not defined!

Required Fix

import {
  Heart,
  PublishSubscribe,
  RequestResponse,
  BloodCell  // ADD THIS
} from '@synapse-framework/core';

Impact

Users copying the quick start code will encounter ReferenceError: BloodCell is not defined or TypeScript compilation errors.

Priority

HIGH - Fix this sprint. Quick start is primary entry point for new users.

References

• Documentation Issue Log: /home/matthias/projects/synapse/DOCUMENTATION_ISSUE_LOG.md (Issue ci: Bump actions/upload-artifact from 4 to 5 #6)
• Documentation Fixes Needed: /home/matthias/projects/synapse/DOCUMENTATION_FIXES_NEEDED.md (FIX-3)

User Story

As a new user, I want complete import statements in code examples, so that I can copy and run the quick start code without missing dependency errors.

Acceptance Criteria

• Add BloodCell to import statement
• Verify all used classes are imported
• Test that quick start code compiles
• Check for similar issues in other quick start examples

Labels

This is a good first issue for new contributors - simple documentation fix with clear solution.

[kluth]

Fixed in commit aa6b17b. Added missing BloodCell import to the circulatory system quick start example. The Heart example now includes 'import { Heart, BloodCell } from '@synapse-framework/core;' so the code will run without import errors.