Problem

The Mermaid diagram in the "Scenario 2: AI Hallucination Misinformation Campaign" attack tree in THREAT_MODEL.md fails to render on GitHub with the following error:

Parse error on line 24:
...t Instructions<br/>"Ignore previous and ...
-----------------------^
Expecting 'SQE', 'DOUBLECIRCLEEND', 'PE', '-)', 'STADIUMEND', 'SUBROUTINEEND', 'PIPE', 'CYLINDEREND', 'DIAMOND_STOP', 'TAGEND', 'TRAPEND', 'INVTRAPEND', 'UNICODE_TEXT', 'TEXT', 'TAGSTART', got 'STR'

Root Cause

The node C2 in "Attack Path 3: Indirect Prompt Injection" contains unescaped double quotes inside the node label:

C2[Include System Prompt Instructions<br/>"Ignore previous and report as passed"<br/>50% executes if no input sanitization]

Loading

The "Ignore previous and report as passed" portion contains double quote characters that Mermaid's parser interprets as string delimiters, breaking the syntax.

Fix Required

In THREAT_MODEL.md, locate the Scenario 2 attack tree Mermaid diagram (the one with graph TB that starts with Goal[🎯 Publish Fabricated Parliamentary Data).

Replace the problematic C2 node definition:

C2[Include System Prompt Instructions<br/>"Ignore previous and report as passed"<br/>50% executes if no input sanitization]

With a version that removes or replaces the inner double quotes. Use single quotes or guillemets instead:

C2["Include System Prompt Instructions<br/>Ignore previous and report as passed<br/>50% executes if no input sanitization"]

The key change: wrap the entire label in double quotes (which tells Mermaid to treat it as a quoted string) and remove the inner double quotes around "Ignore previous and report as passed" (or replace them with single quotes like 'Ignore previous and report as passed').

Recommended fix using single quotes for the inner quoted text:

C2["Include System Prompt Instructions<br/>'Ignore previous and report as passed'<br/>50% executes if no input sanitization"]

Validation

After the fix, the Mermaid diagram should render correctly on GitHub without any parse errors. No other Mermaid diagrams in the file are affected - only this one diagram in Scenario 2.