fix: render global analysis relations in PR diagrams

[ivanmilevtues]

Summary

• load review analyses through Core's canonical unified-analysis parser
• project global leaf relations onto every Mermaid render level using Core's relation projection logic
• keep component-file dropdown status aligned with the projected Mermaid diff
• add regression coverage for Core loader wiring, nested projection, and rendered global edges

This fixes the disconnected diagram observed in CodeBoarding/CodeBoarding-walkthrough#3. Replaying that PR's analysis artifact renders four top-level relations instead of one.

Test plan

• python3 -m unittest discover -s tests (178 tests)
• Black formatting check on touched Python files
• git diff --check
• Replayed the CodeBoarding-walkthrough PR Add --max-label flag to diff_to_mermaid #3 artifact against its base analysis

[codeboarding-review]

Architecture review · 1 component changed

graph LR
    n_Analysis_Orchestrator["Analysis Orchestrator"]
    n_Visual_Diffing_Rendering_Engine["Visual Diffing #38; Rendering Engine"]
    n_Documentation_CTA_Generator["Documentation #38; CTA Generator"]
    n_Telemetry_Feedback_Provider["Telemetry #38; Feedback Provider"]
    n_Analysis_Orchestrator -- "Orchestrates rendering lifecycle" --> n_Visual_Diffing_Rendering_Engine
    n_Analysis_Orchestrator -- "Triggers documentation build" --> n_Documentation_CTA_Generator
    n_Analysis_Orchestrator -- "Provides execution metrics" --> n_Telemetry_Feedback_Provider
    n_Visual_Diffing_Rendering_Engine -- "Provides diffing logic #38; status" --> n_Documentation_CTA_Generator
    n_Documentation_CTA_Generator -- "Resolves method-to-file mapping" --> n_Visual_Diffing_Rendering_Engine
    classDef added fill:#1f883d,stroke:#0b5d23,color:#ffffff;
    classDef modified fill:#bf8700,stroke:#7d4e00,color:#ffffff;
    classDef deleted fill:#cf222e,stroke:#82071e,color:#ffffff,stroke-dasharray:5 3;
    class n_Visual_Diffing_Rendering_Engine modified;
    linkStyle 0,1,2,3,4 stroke:#7d4e00,stroke-width:2px;

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Colors indicate component changes compared to target branch main: 🟩 Added · 🟨 Modified · 🟥 Removed

Download the PR analysis artifacts from this workflow artifact.

Visual Diffing & Rendering Engine : 2 files changed

• scripts/build_component_files.py
• scripts/diff_to_mermaid.py

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⚠️ 1 architecture issue found — open CodeBoarding to explore them.

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_{codeboarding-action · run 29429738579}

[Svilen-Stefanov]

Seems to be working, let's merge it.