Fix dollar sign escaping in continuous DiD tutorial

[igerber]

Summary

• Double-escape dollar signs (\\$) in tutorial 14 markdown cells so MathJax doesn't interpret paired $ on the same line as inline LaTeX delimiters
• Fixes cells in Section 2 (Data Setup) and Section 4 (Interpreting dose-response curves)

Methodology references (required if estimator / math changes)

• N/A — no methodology changes

Validation

• Tests added/updated: No test changes (documentation-only fix)
• Backtest / simulation / notebook evidence: Visual inspection of rendered markdown in Jupyter

Security / privacy

• Confirm no secrets/PII in this PR: Yes

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Generated with Claude Code

[github-actions]

Overall assessment: ✅ Looks good

Executive Summary

• Doc-only change: double-escaped dollar signs in tutorial markdown to avoid MathJax treating paired $ as inline delimiters. docs/tutorials/14_continuous_did.ipynb:L102-L109, docs/tutorials/14_continuous_did.ipynb:L298-L306
• No estimator/assumption changes; tutorial content remains aligned with ContinuousDiD registry and estimator docstring. docs/methodology/REGISTRY.md:L398-L472, diff_diff/continuous_did.py:L1-L45
• Edge-case checklist not triggered because no code paths changed.
• Tests not run (documentation-only change).

Methodology

• Severity: P3 | Impact: Escaping change only; ATT(d)/ACRT discussion unchanged and consistent with ContinuousDiD registry and docstring. | Fix: None. docs/tutorials/14_continuous_did.ipynb:L102-L109, docs/tutorials/14_continuous_did.ipynb:L298-L307, docs/methodology/REGISTRY.md:L398-L472, diff_diff/continuous_did.py:L1-L45

Code Quality

• Severity: P3 | Impact: No code paths changed. | Fix: None.

Performance

• Severity: P3 | Impact: No performance-related changes. | Fix: None.

Maintainability

• Severity: P3 | Impact: No maintainability impact beyond documentation. | Fix: None.

Tech Debt

• Severity: P3 | Impact: No tech-debt impact. | Fix: None.

Security

• Severity: P3 | Impact: Doc-only edit; no runtime or secrets exposure. | Fix: None.

Documentation/Tests

• Severity: P3 | Impact: Notebook markdown updated; tests not run. | Fix: Optionally re-render the notebook or docs build to verify $ displays correctly (no visible backslashes and no MathJax inline-math). docs/tutorials/14_continuous_did.ipynb:L102-L109, docs/tutorials/14_continuous_did.ipynb:L298-L306