FU-P13-T18: Document unified single-config setup for broker + Web UI multi-agent workflows

[SoundBlaster]

Description

Complete FU-P13-T18 by documenting the unified single-config broker + Web UI workflow for multi-agent usage.

Key updates:

• Added one-config examples for Cursor, Zed, Claude Code, and Codex CLI using --broker-spawn --web-ui --web-ui-config <shared-path>.
• Updated dashboard ownership/fallback semantics across README, broker mode docs, web UI setup docs, and troubleshooting docs.
• Synced mapped DocC mirrors for the updated guidance.
• Archived task artifacts and review report per FLOW.

Validation artifact:

• SPECS/ARCHIVE/FU-P13-T18_Document_unified_single-config_setup_for_broker_+_Web_UI_multi-agent_workflows/FU-P13-T18_Validation_Report.md

Quality gates executed:

• pytest (without PYTHONPATH) fails in this repo environment due import resolution.
• PYTHONPATH=src pytest → PASS (692 passed, 5 skipped)
• ruff check src/ → PASS
• mypy src/ → PASS
• PYTHONPATH=src pytest --cov=src/mcpbridge_wrapper --cov-report=term-missing → PASS (91.72% coverage)

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactoring
• CI/CD improvement

Quality Gates

Before submitting, ensure all quality gates pass:

make check

Or run individually:

• make test - All tests pass with ≥90% coverage
• make lint - No linting errors
• make format - Code is properly formatted
• make typecheck - Type checking passes
• make doccheck - Documentation is synced with DocC (if docs changed)

Documentation Sync

If you modified files in docs/, ensure corresponding DocC files are also updated:

docs/ file	DocC file
docs/installation.md	mcpbridge-wrapper.docc/Installation.md
docs/cursor-setup.md	mcpbridge-wrapper.docc/CursorSetup.md
docs/claude-setup.md	mcpbridge-wrapper.docc/ClaudeCodeSetup.md
docs/codex-setup.md	mcpbridge-wrapper.docc/CodexCLISetup.md
docs/troubleshooting.md	mcpbridge-wrapper.docc/Troubleshooting.md
docs/architecture.md	mcpbridge-wrapper.docc/Architecture.md
docs/environment-variables.md	mcpbridge-wrapper.docc/EnvironmentVariables.md
README.md	mcpbridge-wrapper.docc/mcpbridge-wrapper.md

• Documentation changes are synced with DocC catalog (or N/A)

Testing

• Added/updated tests for new functionality
• All tests pass locally
• Manually tested the changes

Checklist

• Code follows the project's style guidelines
• Self-review completed
• Comments added for complex code
• Documentation updated (if needed)
• No new warnings generated
• PR title is descriptive