No uninterpolated template variables in output

Strings like Hello [INSERT_USER_NAME]! or Total: {{amount}} render verbatim in the browser or email client. Users see the literal brackets, support tickets flood in, and the brand takes a direct credibility hit — especially in transactional email, which customers screenshot and share. This is pure placeholder-hygiene rot: the AI emitted a templating stub, no one swapped in real interpolation, and the string shipped.

Replace placeholder tokens with the host language's interpolation and pass real values at render time. For React, use JSX expressions; for emails, use a templating library (React Email, Handlebars, MJML) that binds variables at render. Fix in src/components/Greeting.tsx:

<h1>Hello {user.name}!</h1>

• ID: ai-slop-half-finished.hardcoded-test-data.placeholder-template-variables

• Severity: medium

• What to look for: Walk all source files that produce user-facing output (components, pages, API handlers, email templates). Count all occurrences in string literals of uninterpolated placeholder patterns: [INSERT_X], [INSERT X], [YOUR_X], {{variable}} (inside string literals, not JSX expressions), ${VARIABLE} in single-quoted strings (where the shell-style variable is NOT a template literal), %VARIABLE%, <VARIABLE> (inside non-JSX strings). EXCLUDE files under **/templates/** where the placeholders are part of a templating system that handles interpolation separately.

• Pass criteria: 0 uninterpolated placeholder patterns in user-facing output strings. Report: "Scanned X user-facing source files, 0 uninterpolated placeholders found."

• Fail criteria: At least 1 source file contains an uninterpolated placeholder pattern in a string that reaches user output.

• Skip (N/A) when: Project has 0 component, page, or email template files.

• Detail on fail: "2 uninterpolated placeholders: 'Hello [INSERT_USER_NAME]!' in src/components/Greeting.tsx (JSX text), 'Total: {{amount}}' in src/emails/receipt.tsx (template variable not replaced)"

• Remediation: Placeholder patterns in shipped strings show up verbatim to users — "Hello [INSERT_USER_NAME]" is what the user actually sees. Replace with real interpolation:

  // Bad: placeholder leaks to user
  <h1>Hello [INSERT_USER_NAME]!</h1>
  
  // Good: interpolate the actual value
  <h1>Hello {user.name}!</h1>
  

  For email templates, use a real templating library (Handlebars, React Email, MJML) and pass the variables at render time.